Why does mining considered the most important industry?

Heat from the sun reaches earth to a. radiation b. convection c. conduction

In a stagnant pool of water, a crayfish may spend much of its time lying with one side of its carapace near the surface of the water. in this position, it will move the walking legs on that side in a rhythmic back-and-forth motion. explain the likely function of this behavior.

Which subatomic particle has a negative charge