explanation text

A natural disaster is a terrible accident, e.g. a great flood , a big fire, or an earthquake. It usually causes great suffering and loss of a large sum of money. The causalities are injured or died. Some people are homeless and need medical care.

Floods occur when the water of rivers, lakes, or stream overflow their banks and pour out into the surrounding land. Floods are caused by many different things. Often heavy rainstorms that last for a brief time can cause a flood. But not all heavy storms are followed by flooding. If the surrounding land is fl at and can absorb the water, no flooding will occur. If, however, the land is hard and rocky, heavy rain cannot be absorbed. Where the banks are low, a river may overflow and flood adjacent lowland.

In many parts of the world floods are caused by tropical storms called hurricanes or typhoons. They bring destructive winds of high speed, torrents of rain, and flooding. When a flood occurs, the destruction to the surrounding land can be severe. Whole villages and towns are sometimes swept away by water pouring swiftly over the land. Railroad tracks and buckles are uprooted from their beds. Highways are washed away.

When a building caught fire, the firemen pitched in to help battle the blaze. Before the pumps were invented, people formed bucket brigades to fight fires. Standing side by side, they formed a human chain from the fire to nearby well or river. They passed buckets of water from hand to hand to be poured on the flames.

The damage of fire did depend a great deal on where it happened. In the country or a small village, only a single house might burn down. But in crowded cities, fire often destroyed whole blocks and neighborhoods before being controlled. What can possibly prevent rivers and lakes from overflowing?

1. What can possibly prevent rivers and lakes from overflowing?

• An absorbent bed

• A rocky surrounding

• A low land

• A high bank

• A high road

A natural disaster is a terrible accident, e.g. a great flood , a big fire, or an earthquake. It usually causes great suffering and loss of a large sum of money. The causalities are injured or died. Some people are homeless and need medical care.

Floods occur when the water of rivers, lakes, or stream overflow their banks and pour out into the surrounding land. Floods are caused by many different things. Often heavy rainstorms that last for a brief time can cause a flood. But not all heavy storms are followed by flooding. If the surrounding land is fl at and can absorb the water, no flooding will occur. If, however, the land is hard and rocky, heavy rain cannot be absorbed. Where the banks are low, a river may overflow and flood adjacent lowland.

In many parts of the world floods are caused by tropical storms called hurricanes or typhoons. They bring destructive winds of high speed, torrents of rain, and flooding. When a flood occurs, the destruction to the surrounding land can be severe. Whole villages and towns are sometimes swept away by water pouring swiftly over the land. Railroad tracks and buckles are uprooted from their beds. Highways are washed away.

When a building caught fire, the firemen pitched in to help battle the blaze. Before the pumps were invented, people formed bucket brigades to fight fires. Standing side by side, they formed a human chain from the fire to nearby well or river. They passed buckets of water from hand to hand to be poured on the flames.

The damage of fire did depend a great deal on where it happened. In the country or a small village, only a single house might burn down. But in crowded cities, fire often destroyed whole blocks and neighborhoods before being controlled. What can possibly prevent rivers and lakes from overflowing?

We know from the text that ....

• River can sweep heavy flood

• People can make money from flood

• The destruction by flood is always less severe

• Water flood is absorbed by land directly

• Typhoons caused heavy flood

A natural disaster is a terrible accident, e.g. a great flood , a big fire, or an earthquake. It usually causes great suffering and loss of a large sum of money. The causalities are injured or died. Some people are homeless and need medical care.

Floods occur when the water of rivers, lakes, or stream overflow their banks and pour out into the surrounding land. Floods are caused by many different things. Often heavy rainstorms that last for a brief time can cause a flood. But not all heavy storms are followed by flooding. If the surrounding land is fl at and can absorb the water, no flooding will occur. If, however, the land is hard and rocky, heavy rain cannot be absorbed. Where the banks are low, a river may overflow and flood adjacent lowland.

In many parts of the world floods are caused by tropical storms called hurricanes or typhoons. They bring destructive winds of high speed, torrents of rain, and flooding. When a flood occurs, the destruction to the surrounding land can be severe. Whole villages and towns are sometimes swept away by water pouring swiftly over the land. Railroad tracks and buckles are uprooted from their beds. Highways are washed away.

When a building caught fire, the firemen pitched in to help battle the blaze. Before the pumps were invented, people formed bucket brigades to fight fires. Standing side by side, they formed a human chain from the fire to nearby well or river. They passed buckets of water from hand to hand to be poured on the flames.

The damage of fire did depend a great deal on where it happened. In the country or a small village, only a single house might burn down. But in crowded cities, fire often destroyed whole blocks and neighborhoods before being controlled. What can possibly prevent rivers and lakes from overflowing?We know from the text that ....

• The pump is the only tool used by fire fighters now

• The pump is the only tool used by fire fighters now

• Fires in big cities are always very big

• People no longer use buckets to control fire

Tsunami

Tsunami occurs when major fault under the ocean floor suddenly slips. The displaced rock pushes water above it like a giant paddle, producing powerful water waves at the ocean surface. The ocean waves spread out from the vicinity of the earthquake source and move across the ocean until they reach the coastline, where their height increases as they reach the continental shelf, the part of the earth crust that slopes, or rises, from the ocean floor up to the land.

A tsunami washes ashore with oftendisastrous effects such as severe flooding, loss of lives due to drowning and damage to property.

A tsunami is a very large sea wave that is generated by a disturbance along the ocean floor. This disturbance can be an earthquake, a landslide, or a volcanic eruption. A tsunami is undetectable far out in the ocean, but once it reaches shallow water, this fast traveling wave grows very large

.Tsunami happened because of.....

• The displaced rock pushes water above it

• A major fault under the ocean floor slips suddenly

• The ocean waves spread out from the vicinity of the source

• The waves moves across the ocean until they reach the beach

• A tsunami is undetectable far out in the ocean

Tsunami occurs when major fault under the ocean floor suddenly slips. The displaced rock pushes water above it like a giant paddle, producing powerful water waves at the ocean surface. The ocean waves spread out from the vicinity of the earthquake source and move across the ocean until they reach the coastline, where their height increases as they reach the continental shelf, the part of the earth crust that slopes, or rises, from the ocean floor up to the land.

A tsunami washes ashore with oftendisastrous effects such as severe flooding, loss of lives due to drowning and damage to property.

A tsunami is a very large sea wave that is generated by a disturbance along the ocean floor. This disturbance can be an earthquake, a landslide, or a volcanic eruption. A tsunami is undetectable far out in the ocean, but once it reaches shallow water, this fast traveling wave grows very large

5. What are the impacts of tsunami?

• The part of the Earth’s crust that slopes, or rises, from the ocean floor down to the land

• B. A tsunami washes ashore with often disastrous effects such as flooding and loss of lives

• A tsunami is a very large sea wave which is not generated by a disturbance a long the ocean floor

• A tsunami is detectable far out in the ocean

• Once tsunami reaches shallow water, the wave never grows very large

Tsunami occurs when major fault under the ocean floor suddenly slips. The displaced rock pushes water above it like a giant paddle, producing powerful water waves at the ocean surface. The ocean waves spread out from the vicinity of the earthquake source and move across the ocean until they reach the coastline, where their height increases as they reach the continental shelf, the part of the earth crust that slopes, or rises, from the ocean floor up to the land.

A tsunami washes ashore with oftendisastrous effects such as severe flooding, loss of lives due to drowning and damage to property.

A tsunami is a very large sea wave that is generated by a disturbance along the ocean floor. This disturbance can be an earthquake, a landslide, or a volcanic eruption. A tsunami is undetectable far out in the ocean, but once it reaches shallow water, this fast traveling wave grows very large

We understand from the text that tsunami ....

• Causes the movement of earth

• Forms a new shape of coastline

• Makes unfortunate event

• Rises a new coastal land

• Displaces rocks to land

Tags

CCSS.RI.11-12.1

CCSS.RI.11-12.2

CCSS.RI.11-12.3

“... producing powerful water waves at the ocean surface.” The synonym of the underlined word is....

• Fast

• Deep

• Quick

• Strong

• Weak

Acid rain is rain that is highly acidic because of sulfur oxides, nitrogen oxides, and other air pollutants dissolved in it. Normal rain is slightly acidic, with a pH of 6. Acid rain may have a pH value as low as 2.8.

Acid rain can severely damage both plant and animal life. Certain lakes, for example, have lost all fish and plant life because of acid rain.

Acid rain comes from sulfur in coal and oil. When they burn, they make sulfur dioxide (SO2 ). Most sulfur leaves factory chimneys as the gaseous sulfur dioxide (SO2 ) and most nitrogen are also emitted as one of the nitrogen oxides (NO or NO2 ), both of which are gasses. The gasses may be dry deposited–absorbed directly by the land, by lakes or by the surface vegetation. If they are in the atmosphere for anytime, the gasses will oxidize (gain an oxygen atom) and go into solution as acids. Sulphuric acid (H2 SO4 ) and the nitrogen oxides will become nitric acid (HNO3 ). The acids usually dissolve in cloud droplets and may travel great distances before being precipitated as acid rain.

Catalysts such as hydrogen peroxide, ozone, and ammonium help promote the formation of acids in clouds. More ammonium (NH4 ) can be formed when some of the acids are partially neutralized by airborne ammonia (NH3 ). Acidification increases with the number of active hydrogen (H+) ions dissolved in acid. Hydrocarbons emitted by, for example, car exhausts will react in sunlight with nitrogen oxides to produce ozone. Although it is invaluable in the atmosphere, low-level ozone causes respiratory problems and also hastens the formation of acid rain. When acid rain falls on the ground it dissolves and liberates heavy metals and aluminum (Al). When it is washed into lakes, aluminum irritates the outer surfaces of many fish. As acid rain falls or drains into the lake the pH of the lake falls. Forests suffer the effect of acid rain through damage to leaves, through the loss of vital nutrients, and through the increased amounts of toxic metals liberated by acid, which damage roots and soil microorganisms.

 What is the text mainly about?

• The definition of acid rain

• The process of acid rain

• The effect of acid rain

• Acid rain

• Rain

The acid of normal rain is .… then the acid rain

• Higher

• Lower

• Denser

• Severer

• The same

Acid rain is rain that is highly acidic because of sulfur oxides, nitrogen oxides, and other air pollutants dissolved in it. Normal rain is slightly acidic, with a pH of 6. Acid rain may have a pH value as low as 2.8.

Acid rain can severely damage both plant and animal life. Certain lakes, for example, have lost all fish and plant life because of acid rain.

Acid rain comes from sulfur in coal and oil. When they burn, they make sulfur dioxide (SO2 ). Most sulfur leaves factory chimneys as the gaseous sulfur dioxide (SO2 ) and most nitrogen are also emitted as one of the nitrogen oxides (NO or NO2 ), both of which are gasses. The gasses may be dry deposited–absorbed directly by the land, by lakes or by the surface vegetation. If they are in the atmosphere for anytime, the gasses will oxidize (gain an oxygen atom) and go into solution as acids. Sulphuric acid (H2 SO4 ) and the nitrogen oxides will become nitric acid (HNO3 ). The acids usually dissolve in cloud droplets and may travel great distances before being precipitated as acid rain.

Catalysts such as hydrogen peroxide, ozone, and ammonium help promote the formation of acids in clouds. More ammonium (NH4 ) can be formed when some of the acids are partially neutralized by airborne ammonia (NH3 ). Acidification increases with the number of active hydrogen (H+) ions dissolved in acid. Hydrocarbons emitted by, for example, car exhausts will react in sunlight with nitrogen oxides to produce ozone. Although it is invaluable in the atmosphere, low-level ozone causes respiratory problems and also hastens the formation of acid rain. When acid rain falls on the ground it dissolves and liberates heavy metals and aluminum (Al). When it is washed into lakes, aluminum irritates the outer surfaces of many fish. As acid rain falls or drains into the lake the pH of the lake falls. Forests suffer the effect of acid rain through damage to leaves, through the loss of vital nutrients, and through the increased amounts of toxic metals liberated by acid, which damage roots and soil microorganisms.

 What is the text mainly about?What is the result of the burning of the coal and oil?

• Ammonium

• Nitric acid

• Sulfur dioxide

• Sulphuric acid

• Airborne ammonia