Cells & Heredity
Chemical Interaction
Astronomy
Earth's Water
Weather & Climate
100
A process of reductional division in which the number of chromosomes per cell is cut in half.
What is Meiosis?
100
One of four substances thought in ancient and medieval cosmology to constitute the physical universe.
What is a Element?
100
The rise and fall of sea levels caused by the combined effects of the rotation of the Earth.
What are Tides?
100
Water located beneath the ground surface in soil pore spaces and in the fractures of lithologic formations.
What is Ground Water?
100
A severe tropical cyclone usually with heavy rains and winds moving a 73-136 knots.
What is a Hurricane?
200
Cell division in which the nucleus divides into nuclei containing the same number of chromosomes.
What is Mitosis?
200
A whole formed by a union of two or more elements or parts.
What is a Compound?
200
The sun with the celestial bodies that revolve around it in its gravitational field.
What is a Solar System?
200
The natural cycle of evaporation of water from the oceans.
What is a Water Cycle?
200
A localized and violently destructive windstorm occurring over land characterized by a funnel-shaped cloud extending toward the ground.
What is a Tornado?
300
The metabolic processes whereby certain organisms obtain energy from organic molecules.
What is Respiration?
300
A fundamental principle of classical physics that matter cannot be created or destroyed in an isolated system.
What is Law of Conservation of Mass?
300
The act of rotating as if on an axis.
What is Rotation?
300
A type of vaporization of a liquid, that occur only on the surface of a liquid.
What is Evaporation?
300
A wind that blows from the land towards a body of water. Also known as an offshore breeze.
What is a Land Breeze?
400
The process of generating offspring.
What is Reproduction?
400
Any process determined by the atomic and molecular composition and structure of the substances involved.
What is a Chemical Change?
400
A single complete turn (axial or orbital);
What is Revolution?
400
The amount of water vapor in the air.
What is Humidity?
400
A cooling breeze from the sea (during the daytime)
What is a Sea Breeze?
500
A proposal intended to explain certain facts or observations.
What is a Hypothesis?
500
The amount per unit size;
What is Density?
500
The force of attraction between all masses in the universe.
What is Gravity?
500
The process of changing from a gaseous to a liquid or solid state.
What is Condensation?
500
The ratio of the amount of water in the air at a give temperature to the maximum amount it could hold at that temperature;
What is Relative Humidity?
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