Which is correct about convection currents? A. Is results to formation of valleys and hills
B. It happen in all layers of the Earth
C. It causes Earthquakes
D. It is made possible by heat and pressure

Why does earth contain such diverse life forms?

Which units ate used to measure both velocity and speed? check all that apply

Based on the observation that only male crickets produce a song, you hypothesize that a male's song is a form of communication to potential mates. you set up a simple experiment to test this hypothesis. in the laboratory, you place a male snowy tree cricket in enclosure a, which is adjacent to enclosureb. in enclosure b, you place other insects, one at a time, and observe their responses to the male's song. the enclosures are designed so that the two insects being tested cannot see or smell each other, but sound is transmitted from enclosure a to enclosureb.