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WorksheetsThe hydrosphere class7
Total questions: 23
Worksheet time: 29mins
Name
Class
Date
1.
How much of Earth's water is unavailable for humans to consume due to its high salinity?
a)
3%
b)
23%
c)
77%
d)
97%
2.
Why must humans clean water before using it?
a)
Humans are unable to digest untreated river water
b)
River water is free of any contaminant or pollutants
c)
Untreated river water is brown and humans prefer clear water
d)
Clear water may contain contaminants that could harm humans
3.
How does the amount of water circulating in the water cycle change?
a)
The amount of water remains constant
b)
The amount of water increases each time it rains
c)
he amount of water decreases and then increases each day
d)
The amount of water decreases every time evaporation occurs
4.
How is freshwater treatment different from wastewater treatment?
a)
Freshwater contains oils and vitamins needed for health
b)
wastewater is not treated after use to protect the environment
c)
Wastewater removes pollution to make potable water
d)
Wastewater is treated after use to protect the environment
5.
Which statement best describes how estuaries are positive environment for animals and plants
a)
They flood regularly destroying organisms' habitat
b)
They provide a safe hatchery full of nutrients and food
c)
They dry up each summer stranding organisms in shallow water
d)
hold high numbers of predators to feed off young organisms
6.
How is the intertidal zone different from the open ocean environment?
a)
Conditions in the intertidal zone remain constant
b)
The intertidal zone's conditions constantly change
c)
The open ocean is the shallowest zone in the ocean
d)
the conditions in the open ocean change continually
7.
Why is nitrogen gas important to the health of the ocean and its organisms?
a)
It is needed to make amino acids, proteins, and DNA
b)
It is the main gas needed for photosynthesis
c)
is needed to produce energy during cellular respiration
d)
Hard-shelled organism need it to make their shells.
8.
How does mining on the ocean floor negatively affect the surrounding ecosystems?
a)
High turbidity clog the gills of ocean organisms
b)
Heavy metals in the food chain causing fish to weigh more.
c)
Increase in suspended solids cover fish make them invisible
d)
Suspended solids in water blind organisms
9.
How does warmer temperature affect plants living in the ecosystem?
a)
holds less solids, allowing pants to grow year round
b)
Holds less gases, making plants to use gas stores in cells
c)
Holds more oxygen, letting plants conduct photosynthesis
d)
Holds more solids, blocks sunlight, and stops photosynthesis
10.
How can a change in the pH of water affect the ecosystem
a)
Higher pH levels suffocates fish and causes them to die
b)
Lower pH levels creates a healthier environment for fish
c)
Change in pH affect which biological &chemical process occur
d)
pH levels changes the temperature of water
11.
How does turbidity describe a water system's health?
a)
High turbidity contains less suspended solids and healthier
b)
Turbid water contains more dissolved gases than solids.
c)
Less turbid water contains less suspended solids than gases
d)
Low turbidity contains more gases and solids in water
12.
Which statement best describes why an algae bloom forms?
a)
Decreased amounts of fish eating on the algae
b)
Decreas of pollution allow algae absorb gases and grow fast
c)
High amount of light stimulate photosynthesis to occur
d)
High amounts of fertilizer from farms/ fast growth of algae
13.
Which organism would be considered the best bio-indicator?
a)
Hawk that eats fish from the lake
b)
Lake fish that can live in a wide range of pH levels
c)
Crab lives in warm, shallow lake waters and sleeps in winter
d)
Bacteria in lake that can tolerate only small changes in pH
14.
Why is such a small amount of freshwater available for humans to readily use?
a)
Majority of freshwater is mixed in with the ocean water
b)
Most of fresh water is frozen in glaciers and polar ice caps
c)
Most of freshwater found in the gas form in the atmosphere
d)
Most of freshwater is liquid in lakes, rivers , & aquifers
15.
All the water on, in , and surrounding the earth
a)
Atmosphere
b)
Hydrosphere
c)
Biosphere
d)
Lithosphere
16.
Study the graph below. Where is most of the Earth's water located?
a)
Rivers and Lakes
b)
Glaciers and Icecaps
c)
oceans
d)
groundwater
17.
Study the graph below. What is the dissolved solid that is most commonly found in Earth's oceans?
a)
calcium
b)
magnezium
c)
sulfur
d)
sodium chloride (salt)
18.
Landform C in the diagram below is a flat area at the bottom of the ocean where sediments settle. What is landform C?
a)
continental slope
b)
abyssal plain
c)
continental shelf
d)
mid-ocean ridge
19.
Which of the following is caused by the gravitational pull of the moon and sun?
a)
ocean waves
b)
ocean tides
c)
ocean currents
20.
Which of the following is true about the unequal heating of land (sand) and water?
a)
land/sand heats up and cools off faster than water
b)
water heats up and cools off faster than land/sand
c)
land and water heat and cool at the exact same rate
21.
Which of the following is true about the unequal heating of land (sand) and water?
a)
land/sand heats up and cools off faster than water
b)
water heats up and cools off faster than land/sand
c)
land and water heat and cool at the exact same rate
22.
Which ocean is marked in the image?
a)
Pacific Ocean
b)
Indian Ocean
c)
Atlantic Ocean
d)
Arctic Ocean
23.
Based on the map, which statement is the best conclusion?
a)
The majority of Earth's surface is covered in land
b)
The majority of the Earth's surface is covered by mountain ranges.
c)
The majority of the Earth's surface is covered by volcanoes.
d)
The majority of the Earth's surface is covered by water.
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