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soil cycle
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a person who works with machinery
machinist
harmful substances in the environment
pollution
natural substances produced without chemicals; not man made
organic mulch
what do you call Mr. Stokes invention?
"clean air machine"
a place where substances are burned reducing them to ashes
incinerator
A man who is a machinist for incinerator company
Rufus STokes
reason of the great increase of pollution
use of fossil fuels
it released as a waste product of photosynthesis
oxygen
gas that absorbed from the air by plants and used during photosynthesis
carbon dioxide
substance that contain nitrogen and oxygen
nitrates
how many percentage is composed of nitrogen gas?
79%
one gases found in our air
nitrogen
give examples of decomposer
molds, mushrooms, bacteria
what is a decomposer?
samples of organis materials
rotted of remains of dead animals
what is compost?
what is erosion
reason why there's a losr of nutrients in the soil
erosion
about how many years to form new soil?
50-100
soil is a unrenewable source
false
how many types of soils just in US
80,000
describe soil?
where doe other plants receives most of it's nutrients?
soil
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