Many scientists believe that the current period of global warming is related to increased levels of
a. carbon dioxide in the earth's atmosphere.
b. radon being released from the earth's soil.
c. nitrogen in the earth's atmosphere.
d. hydrogen in the outermost layer of the earth's atmosphere.

The rocky mountain system stretching from canada to new mexico is a string of mountains running along the wester united states. what factors would mostly cause this arrangement of mountains? intense pressure undemeath a tectonie plate that could not breakthrough the rock subduction of a tectonic plate, which pushed up a neighboring plate into mountains two plates located at a diverging boundary with a third plate rising between them two plates that melted into molten rock, which later cooled into the shape of mountains

Volcanic irruption is most likely to be violent when a) volcanoes near to the sea b) the neck of the volcano is sealed by a plug c) the lava is viscous d) the lava reaches the surface through a fissure e) the volcano is on the ocean floor

Most of earths fresh surface water is found in