What happened in the unobserved past?

How are rocks that cooled within magma chambers found on earth’s surface today? they are pushed up by magma under earth’s surface. they are revealed by erosion of earth’s surface over time. they are pushed to earth’s surface because of their larger size. they are revealed at earth’s surface due to their low density.

What type of lipids are found in all biological membranes?

9. wind power creates pollution. water air soil noise