Because the major changes in Earth's ice masses occurred in the Northern ... or boreal, summer insolation was the most important forcing of the glacial-interglacial cycle. Ice sheets respond ...

This is called insolation. Only approximately 52 per cent of this insolation reaches the earth's surface. The rest is absorbed by water vapour, dust and clouds, or is reflected by the Earth's ...

The Earth's axial rotation is perturbed by gravitational ... Since precession controls summer insolation, it effectively controls the amount and northward penetration of the monsoonal rains ...

(1 mark) Due to the tilt of the Earth, there is no insolation at the poles during the winter solstices as the Earth is tilted away from the sun. (1 mark) Tropical areas receive insolation all year ...