S3 Elect. Geog : Reasons for Climate Change

______ _______ ______ refers to the variation in the global climate or climatic patterns in the long term.

(a)  

Global climate change is characterised by major changes in : (select all that apply)

• temperature

• precipitation

• wind patterns

• altitude

Global Warming is ...

• the increase in global temperatures over a long period of time.

• the increase in global temperatures over several decades.

• the variations in global climate brought about by climate change.

• the opposite of global cooling.

What are TWO possible natural causes of climate change?

• Variations in Solar Output

• Growth of new sunspots

• Volcanic Eruptions

• Animals emitting greenhouse gases

Why do variations in solar output affect the earth's climate?

• The earth is very sensitive to the amount of solar radiation it receives.

• The sun emits varying amounts of solar radiation due to changes in its magnetic field.

• The amount of solar radiation affects the Earth's magnetic field.

• The earth relies on the sun for light.

Sunspots are cooler regions on the sun's surface. During periods of intense solar activity, the number of sunspots (a)   .

Circle the sunspots.

Which statement best explains why higher sunspot activity is linked to higher amounts of solar radiation emitted?

• The areas surrounding sunspots radiate more energy to compensate for lower temperature of sunspot areas.

• The areas surrounding sunspots radiate less energy to match the lower temperature of sunspot areas.

• The sunspots radiate more energy, resulting in higher temperature of sunspot areas.

• The sunspots radiate less energy, resulting in lower temperature of sunspot areas.

When a volcano erupts, what is released into the atmosphere? (select all that apply)

• carbon dioxide

• water vapour

• sulfur dioxide

• ash and dust

Volcanic eruptions result in:

• temporary global cooling

• temporary global warming

• prolonged global cooling

• prolonged global warming