Which is true
a) yes. salt is composed of crystals.
b) no. salt, like all matter is composed of atoms.
c) no. salt like all matter is composed of compounds.
d) no. salt, like all matter is composed of molecules.

Which statements describe the movement of ocean currents around the globe? check all that apply. strong winds force warm water to sink to the ocean floor. the coriolis effect causes warm and cold water to mix. cool dense water sinks to the ocean floor. warm water replaces cool surface water. wind blowing parallel to the shore causes upwelling of cool water.

Light traveling in water, nwater = 1.33, strikes a plastic block at an angle of incidence of 51.4°; part of the beam is reflected and part is refracted. if the index of refraction of the plastic is 2.0, what is the angle made by the reflected and refracted beams?

Which planet do you think would be easiest for humans to colonize some day?