Y GEO FIN

During the last ice age:

• Earth's average temperature was higher than usual.

• Glaciers receded completely.

• There was no life on Earth.

• Earth's average temperature was lower than usual, and glaciers spread.

Earth's climate has been changing ever since the planet formed, about:

• 1 billion years ago.

• 2.6 million years ago.

• 10,000 years ago.

• 4.5 billion years ago.

During the Little Ice Age, global temperatures were:

• Higher than normal.

• Lower than normal.

• The same as today.

• Fluctuating rapidly.

Over the past 10,000 years, the average global temperature has been around:

• 10°C.

• 20°C.

• 5°C.

• 13°C (or 14°C/15°C).

The period from around 950-1250 CE with warmer temperatures is called:

• The Ice Age.

• The Medieval Warm Period.

• The Greenhouse Period.

• The Glacial Period.

Tree rings provide information about:

• Growth patterns related to climate.

• Carbon dioxide levels in the air.

• Ocean sediment layers.

• Fossil fuel usage.

Ice sheets give scientists clues about climate change because they:

• Contain trapped gases and dust layers.

• Reflect all sunlight away.

• Show visible growth rings.

• Do not melt over time.

Ocean sediment records climate history through:

• Ice cores.

• Fossils and material deposits.

• Tree growth.

• Seismic activity.

Global warming is defined as:

• An increase in volcanic eruptions.

• Rising levels of sunlight.

• Earth's atmosphere getting cooler.

• Earth's average temperature increasing over time.

Over the last 200 years, Earth has warmed by more than:

• 0.2°C.

• 0.5°C.

• 1.5°C.

• 2.0°C.