The process by which water, wind, or ice moves particles of rocks or soil.
What is erosion?
100
Waste that contains unstable atoms.
What is radioactive waste?
100
The theory that carbon dioxide in the atmosphere will raise Earth's temperature.
What is global warming?
100
The percentage of salt water on Earth.
What is 97%?
100
The three "R"s.
What is Recycle, Reduce, and Reuse?
200
A place where municipal solid waste, construction debris, and some types of agricultural and industrial waste are held.
What is a landfill?
200
A substance that reacts quickly when exposed to air, water, or dropped.
What is an explosive?
200
A chemical that provides nutrients to help crops grow.
What is fertilizer?
200
The amount of water on Earth that is freshwater.
What is 3%?
200
One thing you can do to reduce air pollution.
What is (answers vary)?
300
The layer of soil that contains mineral fragments, water, air, decaying matter, plant roots, and living organisms.
What is topsoil?
300
A place where you can burn solid waste safely.
What is an incinerator?
300
Parts of rock, silt, and sand.
What are sediments?
300
One way that you can reduce water pollution.
What is (answers will vary)?
300
One reason we should protect the soil on Earth.
What is so we can grow plants? (answers may vary)
400
The process of helping natural decomposition break down forms of waste.
What is composting?
400
A change in the atmosphere that has harmful effects.
What is air pollution?
400
A colorless, odorless gas that is radioactive.
What is radon?
400
The seven components of the water cycle.
What are condensation, evaporation, precipitation, transpiration, surface runoff, sub-surface runoff, and accumulation?
400
The definition of expression, variable, and coefficient.
What is....
Expression - A problem with a variable
Variable - A number that can vary, which is represented by a letter
Coefficient - The number that is multiplied by a variable.
500
The definition of groundwater.
What is the water that is stored in layers of soil and rock beneath the Earth's surface?
500
A thick brownish haze of large cities.
What is photochemical smog?
500
A colorless, odorless gas that forms when wood, oil, or gas is incompletely burned.