Newton learned that the orbits of planets are the result of?
a. friction
b. gravity
c. inertia
d. both b and c

What is the measurement of how fast an object moves relative to a reference point?

Discuss how the hardness or softness of the landing surface is related to the time required to stop the egg

What effects result when there is an impact between earth and an asteroid? check all that apply. a.massive flooding. b.extinction of many life forms.c.major earthquakes change in average global temperature.d. giant dust cloud