1 . Which of the following time-scales of change in Earth\'s orbit does not appe

Question

1 .

Which of the following time-scales of change in Earth's orbit does not appear to have major implications for climate change during the Pleistocene Epoch?

Question 15 options:

5600 years

26,000 years

41,000 years

100,000 years

400,000 years

2.  

More algae growth leads to ____ low clouds, ____ warming and a _____ feedback during ice ages.

Question 8 options:

less; more; positive

more; less; negative

more; less; positive

more; more; positive

5600 years

26,000 years

41,000 years

100,000 years

400,000 years

Explanation / Answer

1)5600 years.

the tilt of the Earth's axis changes with time, and its described by the 10000 yr problem of Milankovitch theory, which affect the insolation rate on the earth's surface. this insolation varies with a period of 21,000, 40,000, 100,000, and 400,000 years.an another factor is the precession of earth, it is the changes in the axis of rotation due to the gravitational effects, earth's axis of rotation has a period of 26000 years.

2)more; less; positive

presence of co2 in the earths atmosphere is responsible for the warm the atmosphere, algae take the CO2, when algae die and sink the CO2 cannot escape to the atmosphere, this reduces the temperature and cool the planet, this large algae growth would have contributed to the ice age.

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