The coolest layer of the earth is * D). inner core
C). mantel
A). outer core
B). crust

Deer cave cannot support photosynthesis is as not enough sunlight is present. in spite of this, it still has a complex food chain. what is the energy foundation of this food chain?

There are fewer than 100 naturally occurring elements in the universe, but there are millions of different unified substances. explain how this can be true.

The united states uses which source of energy to produce almost 40 percent of its electricity