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Science · Earth sciences
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6. The variation between glacial and interglacial (warm) climate in the last 800,000 years may be best explained by

Alternating periods of high and low global volcanic activity

Cyclical changes in Earth's position with reference to the Sun

Periodic releases of frozen methane from the deep ocean

Cyclical changes in Earth's albedo

7. Climate scientists use computer models to predict climate in the future. The reliability of climate models is primarily determined by

Running the same model with different grid sizes

Running model components (submodels) independently

Separating natural from anthropogenic inputs in the model

Running the model with known past starting conditions and comparing its output with observations

8. According to the 4th Assessment Report of the IPCC, global temperature is predicted to rise by how about many degrees centigrade in the 21st century?

1 to 4

1 to 8

0 to 2

3 to 7

9. By the last decade of the 21st century, surface temperatures will increase the most in which region, according to the IPCC?

Northern Africa and Saudi Arabia

Equatorial Pacific Ocean

Antarctica

Arctic regions

10. The IPCC projects future climate through the use of different scenarios which differ primarily in what way?

The rate of future population growth in each

The pattern of future urbanization in each

The net radiative forcing in each

The particular climate model used for each

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