Learning about Earth's Past: Landform Diagrams
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Questions and Answers

What is the main concept behind the law of superposition?

  • Younger rocks are always layered on top of older rocks.
  • The youngest rocks are at the bottom and the oldest rocks are at the top.
  • The oldest rocks are at the bottom and the youngest rocks are at the top. (correct)
  • The layers of rocks are always tilted at an angle.

    • How can you infer that an intrusion is younger than the rock layers it cuts across?

  • The intrusion would have fewer visible layers.
  • The intrusion would be tilted at a different angle from the rock layers.
  • The intrusion cuts across the existing rock layers without bending them. (correct)
  • The intrusion would show signs of erosion.

    • What geological event could have caused a big unconformity as described in the text?

  • Meteorite impact
  • Volcanic eruption
  • Severe earthquake
  • Glacial movement (correct)

    • What key idea states that sedimentary rocks are originally formed in horizontal layers?

    <p>Horizontality principle</p> Signup and view all the answers

    In a scenario where a river erodes away existing rock layers and new sediment begins to accumulate, what geological process is exemplified?

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

    What happened first in the formation of the landform?

    <p>Layering of rock</p> Signup and view all the answers

    According to the law of superposition, which layer would be the oldest in the formation?

    <p>Layer 1</p> Signup and view all the answers

    What caused the folding and bending of the rock layers?

    <p>Forces in the earth</p> Signup and view all the answers

    What geological event would come after the deposition of layers 1-4 in the landform formation?

    <p>Magma leaking through the rock</p> Signup and view all the answers

    Why are layers 6 and 7 at the top of the landform formation?

    <p>They were eroded down to form an unconformity</p> Signup and view all the answers

    What is the main principle of geology that states that the present is the key to the past?

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

    What is a landform diagram?

    <p>A drawn cross-section of a landform showing its layers</p> Signup and view all the answers

    Why is the law of original horizontality important in deducing geological history?

    <p>It describes how rock layers are initially deposited horizontally</p> Signup and view all the answers

    What does studying a landform diagram help us understand?

    <p>The changes that occurred to the landform over time</p> Signup and view all the answers

    Which term refers to the idea that natural laws have stayed consistent throughout Earth's history?

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

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