Download Biogeochemical Cycles

Standards
1d- Know how water, carbon, and
nitrogen cycle between abiotic
resources & organic matter in the
ecosystem and how oxygen cycles
through photosynthesis &
respiration.
 7a - know the carbon cycle of
photosynthesis & respiration and the
nitrogen cycle

7b- Know the global carbon cycle:
the difference physical and chemical
forms of carbon in the atmosphere,
oceans, biomass, fossil fuels, &
movement of carbon among these
reservoirs.
 7c – Know the movement of matter
among reservoirs is driven by
Earth’s internal and external sources
of energy.

Biogeochemical Cycles
Water, Carbon, & Nitrogen
What is a biogeochemical cycle?

Cycling of chemicals
between living things &
earth.
Water Cycle – REP IT

R unoff
– Flowing over land

E vaporation
– Land to atmosphere

P recipitation
– Atmosphere to Land

I nfiltration
– Top of land into Earth

T ranspiration
– Water from leaves into
atmosphere
Major Reservoirs of Carbon
Atmosphere
 Biomass
 Ocean
 Fossil Fuels

Carbon Cycle
Carbon Dioxide (CO2)

Uses CO2
– PLANTS

Releases CO2
– Burning fossil fuels
– Respiration
(breathing)
– Decaying organisms
– Consumption
Carbon in Oceans
 CO2 can dissolve
from the atmosphere
into the ocean

This carbon can
combine with calcium
to make calcium
carbonate
– Animals use this to
make shells
– Over time discarded
shells make limestone
Carbon & Oxygen Cycles
Nitrogen Cycle

Nitrogen Fixing
– N in Earth is made into
the correct type of
Nitrogen (NITRATES)

Nitrification
– N in atmosphere is taken
into Earth

Denitrification
– N is taken from Earth and
released into the
atmosphere
Why is Nitrogen Important?

PLANTS – Need nitrogen (NITRATES) to grow

Amino acids (proteins)

DNA