The earth's core is
a.
cooler than the crust but hotter than the mantle.
b.
cooler than both the crust and the mantle.
c.
hotter than the crust hut cooler than the mantle.
d. hotter than both the crust and the mantle.

glacial erosion, the picking up and movement of earth beneath a glacier, is also referred to as plucking. erosion and transportation of individual pieces of bedrock, especially large "joint block occur as a result of this glacial erosion. plucking is type of erosion in which rocks become frozen into the bottom and sides of the glacier.as the glacier moves downhill it 'plucks' the rocks frozen into the glacier from the ground.

1. is geographic distribution

2 is increasing complexity

3 is transitional forms