2.
an object's mass on earth
4.
source of energy driving the water cycle
5.
water changing into water vapor
7.
physical "feel" of matter (property)
8.
needed to cause motion or change
9.
precipitation not absorbed in soil
10.
when energy causes change
12.
data obtained by observation
13.
visual perception of reflected light
14.
evaporation of water by plants
15.
no matter added or lost (system)
16.
change in state/form but not substance
