Causes of and evidence for climate change

Over the last 800,000 years, the earth's average temperature is lower than it has been today.

• True

• Flase

How much have global temperatures increased by since 1880?

• About 1^oC

• About 2^oC

• About 3^oC

• About 4^oC

What is causing rising sea levels?

• Ice caps melting.

• Glaciers melting.

• Thermal expansion

• Rain.

How do scientists work out the temperature of the earth going back thousands of years?

• Tree rings

• By making it up

• Ice cores

Since 1975, how much has arctic sea ice thinned?

• 25%

• 50%

• 75%

• 100% (No ice left)

Which if these are natural causes of climate change?

• Variations in solar output

• Changes in the earth's orbit known as Milankovitch cycles

• Carbon dioxide emissions from burning fossil fuels.

• Volcanic activity

Changes in the shape of the earth's orbit are called:

• Eccentricity

• Precession

• Axial tilt

Changes in the angle of the earth's is called:

• Eccentricity

• Precession

• Axial tilt

The wobble of the earth on its axis is known as:

• Eccentricity

• Precession

• Axial tilt

Identify the greenhouse cases from the list.

• Nitrogen

• Carbon dioxide

• Methane

• Nitrous oxides