4th Grade Science PSSA Vocab - #4

Front

Mass of air surrounding Earth.

Back

atmosphere

Front

A region with specific weather patterns.

Back

climate

Front

Something from a plant or animal that lived long ago, found in rocks.

Back

fossil

Front

Diversity of plants and animals in an environment.

Back

biodiversity

Front

A collection of things that work together.

Back

system

Front

Ability to transfer heat or electricity.

Back

conductivity

Front

Economic activities linked to agriculture.

Back

food and fiber system

Front

Force between two rubbing objects.

Back

friction

Front

Something that may change in an experiment.

Back

variable

Front

Instrument showing wind direction.

Back

windsock