What was considered to be the starting point of the Space Race between the Soviet Union
and the U. S.?

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.

Hey, i was what is consisted in a sustainable city? like what unique designs they have, etc. for answering ; )

Are divergent boundaries responsible for tsunamis?