1.
Storing rainwater is one method to ___ freshwater
2.
____ are built across rivers to control the it's flow
3.
Deepwater ___ spill made front page news in 2010
4.
Lakes that create an abundance of nutrients are __
5.
Water that is safe to drink
6.
Cost-benefit analysis involves ___ assessment
7.
Steam engines greatly increased the efficiency of agriculture, ___, and transportation
8.
The practice of growing, breeding, and caring for plants and animals used for food
9.
The law of supply and ___ plays a huge role in the economic environment
10.
Undesired change in air, water, or soil is known as ___
11.
The layer of rock between earth’s crust and earth’s core
12.
A gas molecule that is made up of three oxygen atoms
13.
the transfer of energy as heat through a material
14.
The mostly solid, rocky part of the earth; extends from the center to the surface
15.
The thin and solid outermost layer of the earth above the mantle
