Word Cards for Unit 2

1globe

A model of the earth.

Example: The globe shows us where the land is and where the water is on the earth.

2salt water

Water that is full of salt.

Example: People cannot drink salt water.

3fresh water

Water that does not contain salt.

Example: People can drink fresh water.

4ocean

A large body of salt water.

Example: The ocean has salt water.

5lake

A large body of fresh water.

Example: The lake water can be used for drinking.

6polar ice cap

A thick cover of ice.

Example: The polar ice cap contains fresh water.

7map

A flat picture of what is foundon the earth.

Example: The map shows us where the oceans are.

8bar graph

A graph that uses bars to represent information.

Example: The bar graph can show us how much water we use.

9ground water

Water that is located under the ground.

Example: Some people pump ground water up from the ground for their water.

10wetland

Low lying land that has wet soil and plants poking up through it

Example: The wetlands behind our school are protected.

11prediction

A good guess about what might happen.

Example: We can make a prediction of how much water we use.

12experiment

A planned test to find outsomething that is unknown.

Example: We did an experiment to learn more about water.

13observation

The act of looking closelyat something.

Example: Scientists learn about things through observation.

14estimate

A careful guess about the amount or size of an object/idea.

Example: Our estimate was close to the actual number.

15actual

The real amount or size of something.

Example: We counted the actual number of cups of water in the bucket.

16model

A smaller version of an object.

Example: The toy airplane is a model of a real airplane.

17mixture

A combination of two or more items.

Example: The mixture included several different things.

18settling

Stopping movement and landing on the bottom of something.

Example: The dirt is settling to the bottom of the jar.

19chemical

A substance used in a chemicalprocess.

Example: The chemical will take some of the dirt out of the water.

20filtering

The removal of solids from a liquid or gas using a material that has tiny holes.

Example: Filtering water takes the dirt out of the water.

21conserve

To keep safe from loss, destruction, or waste.

Example: We will find ways to conserve water.

22liquid

Something that has weight, takesup space, and can change shape.

Example: The water is a liquid.

23solid

Something that has weight, takes up space, and has a definite shape.

Example: The ice cube is a solid.

24thermometer

An instrument to measure temperature.

Example: The thermometer says that it is 54 degrees outside.