8th Grade PSSA Science Review

It is a force that pulls an object toward Earth.

A method of planning or conducting a scientific study to answer a question or problem

a low area between mountains or hills where streams and rivers often flow

Change in state from a gas to a liquid, usually caused by cold air

An open cylindrical container with a pouring lip; used for mixing larger amounts of substances

Water that fills the cracks and spaces in underground soil and rock layers.

agriculture means...

A changing to fit new conditions

Release of harmful materials into the environment

A living thing

All of the living things in an environment

the area of land that is drained by a water system. Separated by mountain ranges

An explanation based on your observation or measurement

A state of matter in which the object has a definite shape and volume.

A group of related parts that work together

the task of grouping organisms together by similar traits, 

the path that an object follows as it travels around another object in space

A system formed by the interaction of a community of organisms with their physical environment

A measure of how hot or cold something is

A personal belief or judgment that cannot be proven true

All of the many factors that influence and affect life in an area.

instrument used to measure temperature

Ecosystems of several types in which vegetation is surrounded by still water. Swampy areas

a natural resource that can be replaced

a resource that cannot be replaced

An organism that obtains energy by feeding on other organisms

the ability of a material to allow either heat or electricity to flow through it

Any standard instrument of measurement- marked at established intervals (size, distance)

Change in a kind of organism over time

An underground formation that contains groundwater

A change in which one or more substances combine or break apart to form new substances.

All of the non living factors in an environment

information obtained through the senses.

hand held device used to magnify materials during observations

characteristics that can be observed, measured, or changed and used to identify matter.

The change of a liquid to a gas

A simplified version of something complex used (analyze, solve problems or make predictions.)

Anything that has mass and takes up space

A change that affects the appearance but not the chemical makeup of a substance.

The breaking down of organic matter.

is like a pathway made of wires that electrons can flow through

A state of matter that has a definite volume but no definite shape.

A series of steps in which organisms transfer energy by eating and being eaten

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

Amount of space occupied by an object

Energy from the sun

a body of land with water surrounding it on three sides.

liquid magma that reaches the surface; also the rock formed when liquid lava hardens.

Water in the form of a gas

A measure of the amount of matter in an object

A mixture of gases that surrounds a planet or moon.