Transcript Cycles_of_Matter - District 128 Moodle

Cycles of Matter
Life Science
(the best class ever)
What is a cycle?

Examples:
 Bicycle
 Motorcycle
Where does matter come from?
The same matter has been around since
Earth began.
 Matter gets recycled

Water Cycle

Different phases of water
 Solid
 Liquid
 Gas
ice
water
steam (water vapor)
Water Cycle

Step 1
 Evaporation
Liquid water changes into steam (water vapor)
 Caused by heat
 Example: when you boil water, steam rises
 When the steam rises (goes up) it mixes with
colder air

Water Cycle

Step 2
 Condensation
Steam (gas) turns back into drops of water (liquid)
 When many drops group together in the sky, they
form clouds.
 Examples: water on the mirror after a shower, dew,
water on car windows in the morning

Water Cycle

Step 3
 Precipitation


Large drops of water fall as rain (or snow in winter)
Step 4
 Transpiration

Water moves through living things
Water Cycle

Groundwater
 Water


that stays underground
Lakes, rivers, streams
Runoff
 Water
that moves across the surface of the
land

Infiltration
 Water
soaks (filters) into the ground
Nitrogen Cycle
Organisms need nitrogen to make proteins
(muscles, hair, skin)
 Plants fix nitrogen so we can use it.

 Special
bacteria on plant roots fix nitrogen.
 It is called nitrogen fixing bacteria.

Plants use the nitrogen that we fix.
Nitrogen Cycle
Herbivores eat producers (plants).
 Omnivores and carnivores eat herbivores.
 Carnivores eat omnivores and carnivores.
 Animals and plants have nitrogen in them
from the food they have eaten.
 Animals and plants eventually die.

Nitrogen Cycle
The nitrogen from animals and plants goes
back to the soil (dirt, ground) when
something dies.
 Decomposers break down the dead
organism.
 There is new nitrogen in the soil for plants
to fix.

Carbon Cycle

Organisms give and take carbon and
oxygen from air and water.
 Usually
as oxygen gas (oxygen in water for
fish, oxygen in air for us to breathe) or
 As carbon dioxide gas

Pop bubbles (makes you burp)
Carbon Cycle
Carbon Cycle = movement of carbon
through the ecosystem
 2 main processes

 Photosynthesis
 Respiration
Carbon Cycle

Photosynthesis
 Producers,
plants
 H2O + CO2 + energy
 Water + carbon dioxide + sun
C6H12O6 + O2
glucose (food) + oxygen
 Carbon dioxide CO2 in, oxygen O2 out
Carbon Cycle

Respiration
 Consumers,
animals
 C6H12O6 + O2
 glucose (food) + oxygen
H2O + CO2 + energy
Water + carbon dioxide + energy
 Oxygen O2 in, carbon dioxide CO2 out
 Breathe – on – your – fingers demo