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Grade 4 Science Semester 2 Review
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Which process builds land?
 
Deposition
 
Weathering
 
Erosion
 
Melting
Which is an example of weathering?
 
Rock breaking into sand
 
Soil moving away
 
Trees growing
 
Water freezing
Which soil is BEST for plants?
 
Loamy
 
Rock
 
Clay
 
Silt
What do embankments do?
 
Stop soil moving
 
Add water
 
Make soil soft
 
Grow plants
What do tree roots do?
 
Hold soil in place
 
Remove soil
 
Dry soil
What is soil erosion?
 
Soil moving away
 
Soil turning to rock
 
Soil growing
 
Soil drying
What changes rocks with heat and pressure?
 
Metamorphic
 
Sedimentary
 
Igneous
Which rock forms from melted rock cooling?
 
Igneous
 
Metamorphic
 
Sedimentary
How many main types of rocks are there?
 
3
 
2
 
1
Which soil has big particles?
 
Sand
 
Loam
 
Clay
 
Silt
How are weathering and erosion different? Weathering ______ Erosion ______
Weathering breaks rocks into smaller pieces. Erosion moves the pieces away.
Why does cutting down trees cause erosion? Trees help because ______ Without trees, ______
Trees help hold the soil with their roots. Without trees, the soil can be moved by wind or water.
How can humans cause erosion? Humans cause erosion by ______ For example, ______
Humans cause erosion by cutting trees or building. For example, when trees are cut down, the soil can move easily.
What is deposition?
 
Dropping soil in a new place
 
Breaking rocks
 
Moving soil
 
Growing plants
What is erosion?
 
Soil being moved away
 
Soil staying in one place
 
Soil growing
 
Soil being broken
What helps plants grow in soil?
Nutrients in the soil
Which soil is best for plants?
 
Loam
 
Clay
 
Rock
 
Sand
What is weathering?
 
Breaking rocks into smaller pieces
 
Growing plants
 
Making soil wet
 
Moving soil
What is soil made of?
 
Rock, air, water, and organic matter
 
Only water
 
Only rocks
 
Only sand
What would happen if there was no friction?
Without friction, things would slide everywhere and we could not walk or stop easily.
Why is friction important?
Friction is important because it helps us walk, stop, and control movement.
What happens when the same poles meet?
The same poles repel and push away from each other.
What happens when opposite magnet poles meet?
Opposite poles attract and pull towards each other.
What happens when two objects fall?
They fall at the same speed (if there is no air resistance), even if one is heavier.
Why do car tyres have high friction?
Car tyres have high friction so they can grip the road and not slip.
Give an example of low friction
sliding on ice / a slide in a playground.
Give an example of high friction
car tyres on a road / walking on rough ground
Give an example of a pull
pulling a drawer / pulling a rope
Give an example of a push
pushing a door open / pushing a chair.
Which is the best example of friction?
 
A book sliding and slowing down on a table
 
A magnet pulling metal
 
A person standing still
 
A ball flying through the air
What does gravity do?
 
Pulls objects toward the ground
 
Makes objects float in the air
 
Pushes objects away from Earth
 
Stops objects from moving
What is a force?
 
A push or pull on an object
 
A type of energy only found in magnets
 
Something that only makes objects move fast
 
A force only happens when objects stop
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