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7th Grade DCA 3 Review

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  • Which layer is the youngest?
    F
  • What keeps satellites in orbit around Earth?
    Gravity
  • What force keeps planets orbiting the Sun?
    Gravity
  • In sedimentary rock layers, how do we know which fossil is the youngest?
    It's at the top.
  • How would an object increase gravitational strength? Looking for two things.
    Increase mass and decrease distance
  • In sedimentary rock layers, how do we know which fossil is the oldest?
    It's at the bottom.
  • Which rock layers are older than rock layer B? Name all of the layers.
    C & D
  • Which object pair has a stronger gravitational pull? Why?
    A, because they are closer together
  • A rock layer contains fossils of fish, while the layer above it contains fossils of amphibians. What does this suggest?
    Fish lived earlier than amphibians.
  • Gravity is strongest when
    Close together and large
    Far apart and small
    Far apart and large
    Close together and small
  • Which object pair has weaker gravitational strength? Why?
    A, because they are smaller/have less mass
  • Why did the Science community reject Alfred Wegener's Continental Drift Theory?
    He did not have a way to prove how the continents moved.
  • Suppose you were an Astronaut that has a mass of 80 kg and a weight of 154 lbs on Earth. You travel to the moon and noticed something different. What changed?
    Your weight stays the same but your mass has changed
    Both your mass and weight stayed the same
    Your mass stays the same but your weight has changed
    Both your mass and weight have changed
  • What would happen to your WEIGHT if you visited a smaller planet like Mercury?
    Weight would change/decrease
  • What's the name of the Supercontinent that Alfred Wegener put together?
    Pangaea
  • Why does an object weigh less on the Moon than on Earth?
    The Earth has more mass than the moon
  • The Earth's surface is made up of more than 2/3 of what?
    Water
  • Why are fossils great evidence of Continental Drift?
    Because the same fossils are found in different Continents.
  • What did the Continental Drift Theory suggest?
    All of the continents were once connected/continents drifted apart to their current positions.
  • Which object has a stronger gravitational pull on the Earth?
    Object 1
  • What are asteroids mostly made of what material?
    Rock
  • Why does Jupiter have stronger gravitational pull than Mercury?
    Jupiter is larger in size
  • What two factors affect gravitational strength?
    Mass and distance
  • What can scientists learn from fossils of tropical plants found in Antarctica?
    Antarctica was once a warm continent
  • Which rock layers are younger than layer C? Name all of the layers.
    A & B
  • Which object has a stronger gravitational pull on the Earth?
    Object 1
  • What would happen if two objects were to be further apart? What would happen to their gravitational pull?
    The force of gravity weakens with increased distance
  • What would happen to your MASS if you visit Jupiter.
    Mass would not change
  • What drives the movement of tectonic plates?
    Convection currents in the mantle
  • If a fossil is found in the topmost layer of rock, what does that indicate about its age?
    It is the youngest fossil in the rock formation
  • What occurs in the ocean floor that creates new rocks? What's that process called?
    Seafloor Spreading or Mid-Ocean Ridge
  • Who came up with the Continental Drift Theory
    Alfred Wegener
  • Which object pair demonstrates greater gravitational strength?
    B, because they are larger/have more mass
  • Which layers show that organisms were not present?
    A & E
  • What is one way fossils provide evidence for Continental Drift Theory?
    Fossils of the same species are found on continents now far apart
  • Which fossil is the youngest?
    Mammoth
  • Where is the asteroid belt located?
    Between Mars and Jupiter
  • Fossils support what theory?
    Continental Drift Theory
  • Name 2 pieces of evidence that supported Wegener's theory of Continental Drift.
    Fossils, Glacial Striations/Climate Clues, Similar Rock Layers/Identical Mountains, or Puzzle-Like Fit
  • Where do convection currents occur in the Earth that moves the plates around?
    Mantle
  • Why don’t asteroids fall into the Sun?
    Gravity keeps them in orbit
  • Seafloor Spreading supports what theory?
    Plate Tectonics Theory
  • Which fossil is the oldest?
    Trilobite
  • Evidence of __________ spreading shows that new crust is forming and plates are moving apart.
    Seafloor
  • What happens to gravitational pull if the distance between two objects doubles?
    It decreases
  • Which object pair has a weaker gravitational pull? Why?
    B, because they are further
  • What would happen to the gravitational strength as mass increases?
    Gravitational strength increases
  • Convection currents occur where in the Earth?
    Mantle
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