1. Which feedback did NOT amplify the orbital forcing that starts glacials? Carb

Question

1.

Which feedback did NOT amplify the orbital forcing that starts glacials?

Carbon solubility feedback

Ice-Albedo feedback

Water vapor feedback

Weathering feedback

2.  

Which of the following is NOT considered a climate forcing?

Solar insolation changes

Volcanic erruptions

Water vapor feedback

Plate tectonics

3.  

Which of these act as feedbacks to amplify orbital forcing and start an ice age?

Surface albedo feedback

Water vapor feedback

CO2-solubility feedback

All of the above

4.  

When the Indian and Eurasian plates collided about 45 million years ago during the Eocene, the Himalayan Mountains and Himalayan Plateau were formed. This is thought to have lead to increased weathering rates due to a larger area of exposed rock, which ___________ atmospheric CO2 levels and led to global ____________.

stabilized; stability

raised; warming

lowered; cooling

5.  

In the Great Lakes region of the United States, there are large piles of sand, pebbles, and mud in otherwise flat areas, and the few exposed rocks have large scratches on their surface. What do you think might have happened in the region's past given this information?

Glaciers

Asteroid impact

Volcanic activity

Earthquakes

Carbon solubility feedback

Ice-Albedo feedback

Water vapor feedback

Weathering feedback

Explanation / Answer

1. c. Water vapour feedback

Explanation: Water vapour feedback is a positive feedback. i.e increase in water vapour increases temperature. Hence it did not amplify the orbital forcing that starts glacials

2. b. Volcanic erruptions

d.Plate tectonics

Explanation: Plate tectonics and volcanic eruptions are internal processes of the earth and hence are not climate forcing

3. a. Surface -albedo feedback

Explanation: Surface albedo feedback is a negative feedback. When albedo increases more sunlight is reflected and less is absorbed. Hence temperature is lowered, helping glaciation.

4. c. lowered; cooling

Explanation: More weathering creates a negative feedback. i.e the temperature is lowered with increase in weathering. This is because more of the atmospheric C02 participates in the weathering process resulting in decrease of C02 in atmosphere

5. a. Glaciers.

Explanation. The large piles of sand , pebble and mud in otherwise flat areas are deposits brought by the glaciers. These deposits are carried by glaciers , and once the galciers start melting the deposits are dropped on flat lands.

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