Scientists estimate that our earth is approximately 4 billion years old by looking at

1 point
a.
samples of dirt and clay from meteorite impact sites

b.
samples of fossils found in south america

c.
samples of rock from areas of earth believed to have undergone melting and the cooling

d.
samples of wooly mammoth hair from russia

The answer would be ¢

The answer is atmosphere. there are four spheres of the earth: 1. geosphere (from greek word 'geo' = ground), 2. hydrosphere (from greek word 'hydro' = water), 3. biosphere (from greek word 'bio' = life), and 4. atmosphere (from greek word 'atmo' = air). a magnetosphere is a region of space around astronomical objects controlled by the magnetic field of that object. through the process of elimination, since lightning is present in the air, it can be found in the atmosphere.

This movement is also referred to as  glacial plucking