This layer of earth's atmosphere is where most of our weather occurs.
What is the troposphere?
100
It is the "brain" of the cell.
What is the nucleus?
100
A kilogram consists of this amount of centigrams.
What is 100,000 [centigrams]?
100
This root word means living.
What is bio ?
100
Galileo mostly used this simple machine to conclude the existence of friction.
What is an inclined plane?
200
This planet has the most circular orbit.
What is Venus?
200
What plant cells are made of.
What are organelles?
200
This is the SI unit for weight.
What is the newton?
200
One parent is needed for this type of reproduction.
What is asexual?
200
Any element with an atomic number greater than this number is unstable.
What is 83?
300
Name the four gas giants.
What are Jupiter, Uranus, Neptune, and Saturn?
300
"Cells come only from other living cells" is the main idea of this theory.
What is the cell theory?
300
This psychiatrist/neurologist coined the terms "id", "ego", and "superego" and made major contributions in the field of psychoanalysis.
Who is [Sigmund] Freud?
300
This device can be made by combining two basic kinds of solid state rectifiers, resulting in the device's ability to both amplify and rectify a current.
What is the transistor?
400
Saturn's moons consist mainly of this substance.
What is ice/water?
400
All of the living and non-living things interacting in an environment.
What is ecosystem?
400
Earth's air consists primarily of nitrogen, oxygen, and this noble gas.
What is argon?
400
This is the arithmetic mean of 84, 50, 73, 27, and 16.
What is 50?
400
This scientist invented the electromagnet by wrapping wire around an iron rod and sending an electrical current through the wire.
Who is [William] Sturgeon?
500
This kind of cloud is like a blanket in the sky.
What is stray clouds?
500
Rocks, the Sun, water,and air are all found in this part of the ecosystem.
What is an abiotic part of an ecosystem?
500
This tree's wood is prized in terms of furniture-making. Its name is Juglans nigra.
What is [black] walnut?
500
What does square root of (6 + square root of (6 + square root of (6 +...))) equal?
What is 3?
500
The lowest frequency that determines the pitch of a musical note is often called this.