The weight of the atmosphere
Air Pressure
The female reproductive organ that produces and contains egg cells.
Ovary
The loose top layer of Earth's surface made of weathered rock and organic matter.
Soil
The average pattern of weather that occurs in a certain location over many years.
Climate
A type of vertebrate that has dry skin covered with scales
Reptile
A feature, quality, property, or trait of an object or organism.
Characteristic
A type of vertebrate that has hair or fur and feeds its young with milk from the mother.
Mammal
A property of a mineral which describes how it appears when it reflects light.
Luster
The ability to cause changes in matter.
Energy
To bend light as it moves from one material to another.
Refract
The process by which water is changed from a gas (water vapor) to a liquid; a stage of the water cycle.
Condensation
The process by which rocks and other surfaces are broken down
Weathering
An organism that obtains nutrients from other organisms
Predator
The force of attraction between two objects, such as the attraction between Earth and objects on it.
Gravity
The male reproductive structure of a flowering plant.
Stamen
A scientific test or procedure that is carried out under controlled conditions to answer a scientific question.
Experiment
An explanation based on evidence that is not directly observed.
Inference
A behavior that an animal doesn't begin life with but develops as a result of experience or by observing other animals.
Learned Behavior
An organized scientific study of the natural world that may include making systematic observations, asking questions, gathering information, analyzing data, summarizing results, drawing conclusions and/or communicating results.
Investigation
Any condition that can be changed or controlled in an experiment.
Variable
A natural object that orbits a planet.
Moon
Forces that cause a change in motion because they act on an object and don't cancel each other out.
Unbalanced Forces
The highness or lowness of a sound.
Pitch
The form matter can take (solid, liquid, gas).
State of Matter
Seeds travel to new places by water, wind, on an animal's body, or inside an animal's body.
Seed Dispersal