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100

nitrogen fixiation 

what is the conversion of nitrogen gas into ammonia

100

what are nutrients?

what are matter that require for their life processes?

100

transpiration, what is it?

the release of water vapor by plants through their leaves? 

100

what is the core?

what is beneath the earths mantle

100

what is the biosphere

what consists of all the planets living and nonliving parts of the environment?

200

what is consumer

what is an animal that must eat other organisms to obtain nutrients

200

what are aquifers

layers of rock and soil

200

what is evaporation?

 what is the change of a liquid to a gas?

200

what is the mantle

what is a layer of very hot but mostly solid rock?

200

what is the lithosphere?

what is the hard rock on and just below earth's surface?

300
what is a decomposer 

what is an organism that breaks down wastes and other dead organisms

300

what is ground water

what is fresh water from underground


300

what is deposition?

what is the deposition of eroded soil at  new location?

300

what is the crust

what is a thin layer of relatively cool rock on the outside layer of earth

300

what is the geosphere?

what is made of all the rock at and below earths surface?

400

what is photosynthesis

where plants or producers pull CO2 out of the air mixed with water and sunlight to make food

400

what is condensation

a change from a gas to a liquid

400

what are landforms?

 what are features such as mountains or landscapes

400

what is the hydrosphere?

what encompases all water on earth?
400

what is erosion?

what is the removal of soil by water, wind, ice, or gravity?

500

what is primary producers

what is where organisms, including plants and algae, that produce their own food?

500

what is precipitation

when water returns from the clouds

500

what are tectonic plates

what are plates of lithosphere?

500

what is the atmosphere?

what consists of all the layers of gas surrounding our planet?

500

what is a molecule?

what is a combination of two or more atoms of the same type or of different types joined together by covalent bonds?