Cycles 1
All water on Earth is _________, or reused, constantly
recycled
The water cycles is driven by the ______ energy
Sun's
What are the 3 steps of the water cycle?
1. Evaporation
2. Condensation
3. Precipitation
What causes ecosystem changes? (2)
1. Natural events
2. Human actions
What must an organism do in order to survive to the changes in their ecosystem? (2)
1. migrate
2. adapt
What can fix/change nitrogen gas? (3)
1. Volcanic activity
2. Lightning
3. Nitrogen-fixing bacteria
What percent of our body is carbon?
18%
What percent of the air is nitrogen gas?
78%
When more and more animals in a species start dying, they go from...
_______species -> _______species -> _______species
until the whole species dies out.
Threatened
Endangered
Extinct
As organisms continue to die, what is being added to the soil?
Nutrients
How do plants and animals also play a role in the water cycle?
Plants - transpiration
Animals - respiration
Where can we find CO2? (2)
1. Atmosphere
2. Rocks (limestone)
Nitrogen-fixing bacteria live on the root nodules of ________. Give an example.
ex) bean, pea, and peanut plants
What are the first species that appear during a primary succession?
What are they called?
Liches and plants
Pioneer species
How did the Tasmanian wolf become extinct?
Farmers hunted the animals to extinction
Large amount of carbon will remain stored in a tree for as long as it _________.
Carbon stored in plants and other organisms cannot be reused until the plants are eaten or ___________.
Lives
Decomposed
What are 3 ways CO2 is returned to the atmosphere?
2. Decomposition
3. Fossil fuel
What do farmers do to add more nitrogen to the soil? (3)
1. Plant legumes
2. Use nitrogen-rich fertilizers
3. Create compost
They are hardly organisms who live in an otherwise lifeless area
Why is secondary succession faster than primary succession?
The soil has already formed and some organisms might be present
How does nitrogen return to the atmosphere as a gas?
__________ bacteria in the soil change some of the __________ back into nitrogen gas.
Denitirification
Denitrifying
Nitrates
Bacteria plays a key role in the nitrogen cycle.
Bacteria turns...
Nitrogen -> ___________ -> ___________ -> ___________
Ammonia
Nitrite
Nitrate
What is compost?
Why is using compost good? (2)
Mixture of dead organic material that can be used as fertilizer
1. Way to recycle nitrogen
2. Reduces the amount of trash we make
What are 2 types of natural events? Give examples of each.
1. Natural disasters (earthquakes, floods...)
2. Organisms (Beavers building dams)
What are some causes of extinction? (4)
1. Pollution
2. Global warming
3. Habitat destruction
4. Hunting