When traveling upstream from a river along a creek, you encounter ripples in the water, what is that called

Why does physical weathering speed up the processes of chemical weathering? a) physical weathering requires abundant water, as does chemical weathering. b) physical weathering produces fresh surfaces for chemical weathering to attack. c) chemical weathering can occur only on small surfaces, not large ones. d) chemical weathering requires salt, which is provided by salt wedging.

What is the amount of organic matter in all living organisms in a habitat called?

In a command economy, the majority of goods and services are provided by the