Who were the first explorers of the north american continent?

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.

Compounds which are found naturally in the earth are called: a. ores b. composites c. rocks d.minerals

Which was not a country that massively built up its navy in the early 1900s? germany china united statesbritain