1
The law that states "Matter cannot be created nor destroyed". (5 words)
2
The variable that is changed or controlled in an experiment.
3
A variable that is kept the same throughout an experiment.
4
The variable that is measured in an experiment.
5
liquid, solid, and gas (3 words)
6
A pattern (cycle) that allows nitrogen to be fixed by bacteria so plants and animals can use it ant later returns the gas to the atmosphere.
7
The process of changing a gas into a liquid.
8
A system that only allows energy to flow through it.
9
A method of how carbon is released into the atmosphere.
10
What's left of animal and plant remains that provide humans with a source of nonrenewable energy.
11
The process of changing a liquid into a gas.
12
The process where carbon becomes part of a plant, then later is released in the atmosphere then is repeated.
13
The constant movement of water on, above, and below the Earth's surface.
14
A system that allows matter and energy to flow through it.
15
An example of a nonrenewable energy source.
16
Organisms need these in order to survive.
17
Type of organism that takes carbon out of the atmosphere so it enters the ecosystem
18
Type of organism that fixes nitrogen so it can enter the ecosystem
19
The process of nitrogen being fixed so plants/animals can use it.
20
Does not leave the ecosystem but, is constantly being recyceled.
