open to view; easy to understand; seeming to be true or real

a small rocky body orbiting the sun

the basic unit of a chemical element.

An imaginary line that passes through Earth's center and the North and South poles, about which Earth rotates

living things

A consumer that eats only animals.

A change in matter that produces one or more new substances

a Green substance in plant cells that absorbs light energy and helps the plant preform photosynthesis

A ball of frozen dust and rock that orbits the sun and has a tail that glows

the struggle between organisms to survive in a habitat with limited resources

The change of state from a gas to a liquid

Protecting and preserving natural resources and the environment

A group of stars that form a pattern in the sky

An organism that obtains energy by feeding on other organisms

to see; to notice

An organism that breaks down wastes and dead organisms

the living things and nonliving things in an area

A change that is a result or consequence of an action or other cause.

producing results without waste

The change of a substance from a liquid to a gas

The ability to do work or cause change

A state of matter with no definite shape or volume

A pure substance made of only one kind of atom

two or more atoms held together by covalent bonds

Positively charged particle in the nucleus of an atom

negatively charged particle

A small particle in the nucleus of the atom, with no electrical charge

Basic unit of life

A mixture that forms when one substance dissolves another.

A substance that is dissolved in a solution. (salt in saltwater)

Plants use the sun's energy to convert water and carbon dioxide into sugars

process that changes one set of chemicals into another set of chemicals ( something new is formed)

A typical star that is the source of light and heat for the planets in the solar system. The star that is closest to earth .

The ability of an object to transfer heat or electricity to another object.