Ecosystems
The living things in this system.
What are biotic factors?
Most organisms are made mostly of this.
Water
Most of Earth's water is found here.
oceans
Bonus point - What percent?
Nitrogen is an important element in this, which all organisms need to survive.
Proteins
Bonus - Nitrogen is also essential in this, passing on genetic info
This process is the main source of oxygen in Earth's atmosphere.
photosynthesis
Almost all energy on Earth originally came from this.
Sun
The layer of gases that surround the Earth is called this.
atmosphere
These 2 things power the water cycle.
Sun and gravity
The process that changes nitrogen from a gas into a form organisms can use.
Nitrogen fixation
The oxygen cycle involves the change from oxygen to this and back again
carbon dioxide
Sunlight and temperature are examples of these.
abiotic factors
Earth's atmosphere is composed of oxygen and this.
Nitrogen.
Bonus point - Which gas is more abundant in the atmosphere?
Rain, snow, and sleet are examples of this.
Precipitation
These unicellular organisms in the soil and water fix nitrogen gas in compounds that other organisms can use
Bacteria
This cannot be separated by chemical means
Element
bonus - true or false? All organisms contain the element carbon.
Wind, temperature, and moisture influence the daily _________.
weather conditions
Earth's atmosphere protects organisms from what?
the Sun's harmful UV rays
Water changes from a liquid to a gas (water vapor) during this process.
Evaporation
Some animals obtain the nitrogen they need from these, which have absorbed nitrogen compounds from the soil.
plants
When dead organisms decompose, carbon returns to the ____and is released into the atmosphere.
Bonus - how does carbon appear in the atmosphere? (in what form?)
If you describe the average weather conditions of an area over time, you are describing ___________.
Climate
What is made up of rock, water, air, minerals, and the remains of once-living organisms?
Soil
Bonus point - What in the soil recycles nutrients by breaking down the dead organisms?
Water vapor changes back into liquid during this process.
Condensation
This is how nitrogen is returned from organisms back to the environment.
Bacteria - breaks down dead organisms and waste.
Bonus point - this means nitrogen is returned back to the environment through the ____.
Carbon dioxide and other gasses in the atmosphere absorb thermal energy from the sun in this process.
Greenhouse effect
Bonus - what is one "effect" on Earth?