Global climate change - Part 1

Global climate change

Vocabulary.

Climate: is the long-term average of weather in an area.

Greenhouse effect: is a natural process in which certain gases in the atmosphere keep heat near Earth and prevent it from radiating into space.

Latitude: is a measure of a place’s distance from the equator.

Salinity: is the amount of salt dissolved in a body of water.

Multiple Choice

Salinity is

• is the amount of oxygen dissolved in a body of water.

• is the amount of salt dissolved in a body of water.

• is the amount of CO2 dissolved in a body of water.

Multiple Choice

__________is the long-term average of weather in an area.

• Climate

• Weather

1) Sun

2) Wind patterns

3) Ocean

The Sun

Sun is the source of the energy that controls weather and climate on Earth.

Sun energy is transferred to Earth by radiation.

The heating of Earth’s atmosphere by the sun is influenced by:

1] The greenhouse effect.

2] The latitude

Multiple Choice

Sun energy is transferred to Earth by _________________.

• convection

• Concuction

• Radiation

1]   The greenhouse effect.

What is a greenhouse?

It is a building designed for the protection of tender or out-of-season plants against excessive cold or heat. 

Green house effect

About 30 percent of the sun radiation is reflected back into space.

The rest of the solar radiation may be absorbed by Earth and the atmosphere and converted to heat.

Multiple Choice

About__________of the sun radiation is reflected back into space.

• 50 percent

• 30 percent

• 60 percent

Why do we call it greenhouse gases?

The gases that do this are called greenhouse gases because they keep heat inside Earth as the greenhouse does for plants.

Multiple Choice

Major greenhouse gases include________

• Water vapor (H₂O)

  Nitrous oxide (N₂O)

• Water vapor (H₂O)

  Carbon dioxide (CO₂)

• Tropospheric ozone (O₃)

  Nitrous oxide (N₂O)

  Methane (CH₄)

Greenhouse gases absorb heat and release it slowly, while an actual greenhouse traps warm air inside a structure.

Without greenhouse gases, Earth would be too cold to support life.

Open Ended

Can we survive without greenhouse gases? Yes/No

Why?

2]   The latitude.

Latitude is a measure of a place’s distance from the equator.

In general, the greater the latitude, the cooler a location’s overall climate will be.

The seasons are also caused by the changing angles at which sunlight strikes Earth

Multiple Choice

The____________ the latitude, the cooler a location’s overall climate will be.

• smaller

• greater

The seasons are caused as the Earth, tilted on its axis, travels in a loop around the Sun each year.

Summer happens in the hemisphere tilted towards the Sun, and winter happens in the hemisphere tilted away from the Sun.

Multiple Choice

Summer happens in the hemisphere tilted __________the sun.

• towards

• away from