Which of the following statements about erosion is true?
a.
erosion occurs as a result of drastic changes in temperature.
b.
erosion occurs when wind or water moves over sediment, soil, or rocks.
c.
physical and chemical are the two types of erosion.
d.
movement is not required for erosion to take place.

Amountain is larger than a hill, with steep sides true or false

The great scientist alfred wegener proposed that continents have moved, while other scientists such as t. c.chamberlin argued against wegener. wegener's ideas eventually won, and are now widely accepted, because: a) wegener's ideas were more beautiful, and so were favored by the intellectual elite. b) wegener's ideas did a better job of predicting the results of new observations and experiments. c) wegener's ideas appealed to dead white european males, whereas chamberlin's didn't. d) wegener's ideas appalled dead white european males, and we all know that in this politically correct era, dead white european males cannot get a fair shake. e) wegener won the nobel prize.

Where the main factor that enabled the growth of cities and civilizations was the existence of