Grade 8 · Science · Unit 2 of 14
Oceans, Currents & Climate
Salt water, waves and weather
What your child practises
Practises features of the ocean, such as salinity, currents, waves and tides, and how oceans and large bodies of water affect climate and shape coastlines.
Prince Edward Island Curriculum curriculum outcome: Water Systems · ocean features, currents, tides and how water affects climate and coastlines
Sample questions
A taste of this unit. In the app, questions change every time and get easier or harder to match your child.
Question 1
Why are tiny plankton so important?
- they heat the water
- they make waves
- they cause tides
- they are the base of many ocean food chains
they are the base of many ocean food chains
Hint: Small fish eat them, and bigger fish eat the small fish.
Question 2
What are ocean currents?
- large streams of water that move through the ocean
- cracks on the ocean floor
- tall waves at the shore
- tides at a harbour
large streams of water that move through the ocean
Hint: They flow like rivers in the sea.
Question 3
What is the continental shelf?
- a surface current
- a tall mountain chain on land
- the shallow sea floor around a continent
- the deepest ocean trench
the shallow sea floor around a continent
Hint: It slopes gently away from the shore.
Question 4
Coral reefs mostly grow in…
- freshwater lakes
- cold deep water
- muddy rivers
- warm, shallow ocean water
warm, shallow ocean water
Hint: They need warmth and sunlight.
Question 5
Which salt is the main one in seawater?
- sodium chloride
- baking soda
- sugar
- calcium milk
sodium chloride
Hint: It is the same as table salt.
Question 6
A mid-ocean ridge is…
- a coral wall
- a tide pool
- a chain of underwater mountains
- a deep gorge
a chain of underwater mountains
Hint: New sea floor forms along it.