7th grade exam - all topics
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Questions and Answers

How are metamorphic rocks formed?

  • By volcanic eruptions
  • By exposure to air and water
  • By being buried deep in the Earth at high temperatures and pressures (correct)
  • By rapid cooling of magma
  • Volcanoes erupt when magma reaches the Earth’s ______

    surface

    Minerals have a (very complex) ______ formula

    chemical

    Sedimentary rocks are formed from weathered ______

    <p>sediment</p> Signup and view all the answers

    What is the next stage after the Red Giant phase in the life cycle of a star?

    <p>White Dwarf</p> Signup and view all the answers

    What is the fate of Earth and its neighboring planets when the Sun becomes a Red Giant?

    <p>They will be swallowed up</p> Signup and view all the answers

    The Red Giant phase occurs when a star runs out of hydrogen.

    <p>True</p> Signup and view all the answers

    Supernova explosions are the largest and most powerful explosions in the universe.

    <p>True</p> Signup and view all the answers

    What physical process can cause weathering due to the expansion and contraction of rocks?

    <p>Temperature change</p> Signup and view all the answers

    Which of the following can form U-shaped valleys by scraping pieces off surrounding rocks?

    <p>Glaciers</p> Signup and view all the answers

    What can dissolve rock through the action of dissolved acids?

    <p>Acid rain</p> Signup and view all the answers

    As the ice ______ it widens cracks in rocks

    <p>expands</p> Signup and view all the answers

    The movement of weathered rock particles is called ...........

    <p>removal</p> Signup and view all the answers

    What did Alfred Wegener call the single supercontinent that split into Laurasia and Gondwana?

    <p>Pangaea</p> Signup and view all the answers

    What evidence did Wegener use to support his theory of continental drift?

    <p>Fossils of the same species found on continents far apart</p> Signup and view all the answers

    Explain the concept of tectonic plates and their movement in the Earth's crust.

    <p>Tectonic plates are moveable lithospheric plates that sit and move along the molten asthenosphere below. They are responsible for the movement and shifting of the Earth's crust.</p> Signup and view all the answers

    Briefly describe the subduction zone

    Signup and view all the answers

    Which scale is used to describe the resistance of a mineral to scratching?

    <p>Mohs scale of hardness</p> Signup and view all the answers

    What is the streak of a mineral?

    <p>Color of the powder produced when dragged across a surface</p> Signup and view all the answers

    What is cleavage in relation to minerals?

    <p>The way a mineral breaks along definite structural planes</p> Signup and view all the answers

    What does fracture refer to in minerals?

    <p>Property of breaking in a more or less random pattern</p> Signup and view all the answers

    Who created the scale of mineral hardness grading from the softest to the hardest?

    <p>Friedrich Mohs</p> Signup and view all the answers

    True or false: Friedrich Mohs created a scale of mineral hardness from 1 to 100?

    <p>False</p> Signup and view all the answers

    What happens to rocks if they are buried deep in the Earth at high temperatures and pressures?

    <p>They form new minerals and metamorphic rocks</p> Signup and view all the answers

    What did Alfred Wegener call the single supercontinent that split into Laurasia and Gondwana?

    <p>Pangaea</p> Signup and view all the answers

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