2.
mixture of gases forming a layer around earth
3.
all solid rock and minerals on earth
5.
distance light travels in a year
6.
orbit of an object around another object
7.
spin of an object around its axis
9.
causes mountains and volcanoes
10.
causes seafloor spreading
11.
total force acting on an object
12.
push or pull of an object
13.
process of changing position
14.
force that resists the motion of two surfaces that are touching
15.
attractive force that exists between all objects that have mass
16.
net force that does equal zero
17.
net force that does not equal zero
18.
measure of change in velocity during a period of time
19.
speed and direction of a moving object
20.
measure of distance an object travels in a unit of time
25.
fossil fuels, food, batteries
27.
car, skateboard, walking
30.
light, electromagnetic waves, radio
