Can some one answer 4 for me and if u can't read it it says what can scientists learn by studying layers of rock in the earth

Which composition of water moves to begin a deepwater current?

Consider an ideal gas at 27.0 degrees celsius and 1.00 atmosphere pressure. imagine the molecules to be uniformly spaced, with each molecule at the center of a small cube. what is the length l of an edge of each small cube if adjacent cubes touch but don't overlap?

Awave with a frequency of 500 hz is traveling at a speed of 100 m/s.what is the wavelength?