Water and Air
This is what water becomes when it freezes.
ice
This simple machine has a wheel with a rope around it.
pulley
A butterfly starts its life as this.
egg
This state of matter keeps its shape.
solid
This is a special time of year when families celebrate together.
holiday/tradition/celebration
We can't see air, but we can feel it when it does this.
blow or move
This machine is part of a car and helps it roll.
wheel and axle
This is an animal that lays eggs and flies.
bird
Liquids can be poured because they do this.
flow
This word means a group of people who live and work together.
community
This large body of salt water covers most of the Earth.
ocean
A ramp helps people in wheelchairs by being this kind of machine.
inclined plane
This group includes animals like frogs and salamanders.
amphibians
When you freeze a liquid, it turns into this.
solid
Maps often show land and this blue area.
water or oceans
This gas in the air helps people and animals stay alive.
oxygen
A screw can do this when you twist it into wood.
hold it together
This bird cannot fly, but it can swim.
penguin
This is what heat can do to a solid.
melt it
This direction is the opposite of North.
This process happens when the sun heats water and it turns into gas.
evaporation
This machine is made of two inclined planes back-to-back, like a knife.
wedge
These animals have gills and live in water.
fish
Water, juice, and milk are examples of this.
liquids
A person in your family from long ago is called this.
ancestor