Mass extinctions have helped create fossils and other historical artifacts that may help scientists come up with when things were around, and what they may have looked like; therefore creating the geologic time sal.
Answer:
you can try Google I'm not for sure tho
Answer:
for the environment biking
for overall speed airplanes for long distances
Answer:
thicker
Explanation:
The continental crust is thicker and less dense than oceanic crust
