cycles of matter
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CYCLES OF MATTERChapter 2.2
RECYCLING MATTER
Matter can be recycled Matter is anything that takes up space (solid,
liquids, and gases) Energy can’t be recycled
Matter is recycled by moving in cycles, which means they are reused in different ways
WATER CYCLE
This is when water moves from Earth’s surface, to the atmosphere, and then back to the surface
EVAPORATION This is when liquid water turns to gas (steam) Mostly happens on lakes and oceans Energy from the sun makes water evaporate
CONDENSATION This is when water gas (water vapor) cools
and turns back into liquid. Droplets of water stick to a piece of dust and
make clouds
PRECIPITATION When too much
water is in the clouds it rains, snows or hails and falls back to Earth
This is called precipitation
CARBON AND OXYGEN CYCLES
All living things need carbon and oxygen Producers (like plants) take in Carbon Dioxide
(CO2) from the atmosphere They make sugars, which consumers eat Oxygen is released by the producers and
used by consumers
NITROGEN CYCLE
Nitrogen is used by living things to make amino acids, which make proteins, which make…everything.
Muscles, DNA, RNA The air you breathe is 78% nitrogen but you
can’t use it. Why not?
SO HOW DO WE GET NITROGEN? Eat it!
“Free” nitrogen is the kind in the air. Bacteria in the ground captures the free
nitrogen and makes it “fixed” so plants can use it.
NITROGEN FIXATION Nitrogen Fixation is when bacteria takes the
free nitrogen and make it usable by breaking the bonds.
They live in soil, water, and even bumps on some bean and nut plant roots.
RETURN OF NITROGEN Once nitrogen is fixed the plants use it. Decomposers break down the dead plants
(and things that eat the plants when they die).
They give nitrogen back to the ground and release some to air again.
WHAT ELSE HAS ENOUGH ENERGY?
SYNTHETIC NITROGEN FIXATION
PHOSPHORUS CYCLE
BIOGEOCHEMICAL VOCABULARY reservoir: something that holds the
substance over a long amount of time flux: change source: a reservoir that gives off more of
the substance than it takes in sink: a reservoir that takes in more of a
substance than it gives off
WHAT IS PHOSPHORUS? Animals need it to filter waste, repair tissue,
produce energy Plants need it for cell division and
development of new tissue.
LAUNDRY DETERGENT
ALGAL BLOOMS
ALGAL BLOOMS
ALGAL BLOOMS 50 years ago, cause of algal blooms
unknown. Maybe carbon, nitrogen, phosphorus from
agricultural runoff. Small-scale experiments inconclusive. David Schindler divided a lake using a plastic
divider curtain in two. Carbon and nitrogen were added to one half Carbon, nitrogen and phosphorus were
added to the other half. For eight years, phosphorus side developed
algal blooms, other did not.
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