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Grade 8 · Science · Unit 5 of 5

Plate Tectonics

Moving plates, quakes and volcanoes

What your child practises

Earth's layers and moving plates, the three kinds of plate boundaries, the evidence for continental drift and sea-floor spreading, and earthquake and tsunami safety on the BC coast.

Yukon Curriculum learning standard: Plate tectonics: evidence, plate boundaries, earthquakes, volcanoes and the Cascadia subduction zone

Sample questions

A taste of this unit. In the app, questions change every time and get easier or harder to match your child.

  1. Question 1

    Which plate is sliding beneath the North American plate off the coast of BC?

    • the African plate
    • the Juan de Fuca plate
    • the Pacific plate only
    • the Eurasian plate

  2. Question 2

    The Queen Charlotte Fault off Haida Gwaii is a boundary where plates…

    • slide sideways past each other
    • sink into the core
    • collide to make a mountain range
    • pull apart to make a new ocean

  3. Question 3

    Which type of plate boundary is it? Sort each description.

    Sort into: ↔️ Divergent · ➡️⬅️ Convergent · ↕️ Transform

    • 🌊new crust forms at a mid-ocean ridge
    • 🌋an oceanic plate sinks under a continent
    • 🏔️two continents collide to build mountains
    • 🌉the San Andreas Fault
    • ⚡plates grind sideways past each other
    • 🏜️plates pull apart in a rift valley

  4. Question 4

    Where do deep ocean trenches form?

    • In the middle of continents
    • At subduction zones, where one plate sinks beneath another
    • Along sandy beaches
    • At mid-ocean ridges

  5. Question 5

    Alfred Wegener proposed continental drift. What evidence supported it?

    • Weather maps
    • Ocean tides
    • Satellite photos taken in 1900
    • Matching fossils and rock layers on different continents

  6. Question 6

    Which kind of crust is denser?

    • Continental crust
    • It depends on the season
    • Oceanic crust
    • Both are exactly the same

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