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3rd Grade science review Answer Key

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Living Things
#1 What does a bird have on the outside of its body? Feathers
#2 What are reptiles covered in? Dry scales
#3 What do mammals, reptiles, and birds breathe with? Lungs
#4 What is an animal called that eats meat? Carnivore
#5 What are 3 essential characteristics of living things? Grow and change, reproduce, respond to environment
Simple Machines
#1 What is a machine called that has a bar that turns on a fixed point? Lever
#2 What is a machine that can split an object called? Wedge
#3 A door knob is an example of a ___________________. Wheel and axle
#4 What is a machine that is made up of 2 or more simple machines called? Compound machine
#5 How does a lever make work easier? Changes the effort needed and changes the direction of the force
Rocks
#1 What is a fire-made rock called? Igneous rock
#2 What is a rock that is made up of mud, sand, tiny pebbles cemented together called? Sedimentary rock
#3 What is a rock that has change through heating and squeezing called? Metamorphic rock
#4 What is glass made from? Sand
#5 What type of rock is limestone? Sedimentary rock
Forces
#1 What is the force called when you move something away from you? Push
#2 What is the force called when you move something toward you? Pull
#3 What is the force that keeps us on the earth? Gravity
#4 What force can slow something down, create heat or allow you to grip something? Friction
#5 When working with a magnet, how do the poles need to be alligned in order to attract each other? north to south
Soil and Fossils
#1 If a dinosaur made a footprint, what type of fossil is this? Imprint
#2 What is the material called when a fossil forms in tree sap? Amber
#3 What is it called when rocks break down into smaller pieces? Weathering
#4 What are the three layers of soil? Topsoil, subsoil and bedrock
#5 What is the material found in topsoil that was made from things that were once living? Humus
Final Question
What did you like best about science class this year? Accept any answer!