A collection of gravitationally bound celestial objects that orbit a star is called a a) star
b) nebula
c) gravity
d) solar system
e) galaxy

Relatively steep zone that is compared with the shelf that marks the boundary between continental crust and ocean crust.

The diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

Ateam of researchers calculates that a glacier will melt completely away in the next 100 years. which land structure will most likely be left behind after the glacier melts?