How is a wavelength measured?

A.

from crest to crest

B.

from trough to crest

C.

from sea level to trough

D.

from sea level to crest

One should avoid using the information on a site if

Which of the following elements produces no harmful emissions when used as an energy source? A. coal B. oil C. wind D. natural gas

Where in North America has recent glacial activity occurred?

Which one of the following factors is the main source of the earth's heat? a. sun b. pressure c. season d. altitude

True or false much of eastern brazil has either tundra or glacier

In what two ways does the El Niño wind pattern affect human habitation? It creates fertile deltas that humans can inhabit. It brings warm temperatures to the eastern Pacific. It causes violent and life-threatening volcanic eruptions.

In what ways can erosion be both beneficial and harmful to agricultural communities

Which projection takes slices of a globe and stretches them into a rectangle?

What problems threaten the environment of mexico?

What are three causes of small earthquakes that could signal a volcanic eruption?