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7th Grade DCA 3 Review

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  • Fossils support what theory?
    Continental Drift Theory
  • Convection currents occur where in the Earth?
    Mantle
  • Why does an object weigh less on the Moon than on Earth?
    The Earth has more mass than the moon
  • What happens to gravitational pull if the distance between two objects doubles?
    It decreases
  • What is the amount of a substance (solute) present in a specific volume of solution?
    Concentration
  • What drives the movement of tectonic plates?
    Convection currents in the mantle
  • How would an object increase gravitational strength? Looking for two things.
    Increase mass and decrease distance
  • 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
  • Which fossil is the oldest?
    Trilobite
  • What keeps planets orbiting the Sun?
    Gravity
  • What keeps satellites in orbit around Earth?
    Gravity
  • Seafloor Spreading supports what theory?
    Plate Tectonics Theory
  • In sedimentary rock layers, how do we know which fossil is the youngest?
    It's at the top.
  • What two factors affect gravitational strength?
    Mass and distance
  • Which line on the graph show the object stopping and returning back to starting position?
    The mult color line
  • Evidence of __________ spreading shows that new crust is forming and plates are moving apart.
    Seafloor
  • What are layers of impermeable rock in the ground that hold groundwater?
    Aquifer
  • The Earth's surface is made up of more than 2/3 of what?
    Water
  • What are 2 ways you can dilute the concentration of a solution?
    You can increase the amount of solvent or decrease the amount of solute.
  • In sedimentary rock layers, how do we know which fossil is the oldest?
    It's at the bottom.
  • What can scientists learn from fossils of tropical plants found in Antarctica?
    Antarctica was once a warm continent
  • Why don’t asteroids fall into the Sun?
    Gravity keeps them in orbit
  • Where is the asteroid belt located?
    Between Mars and Jupiter
  • Why does Jupiter have stronger gravity than Mercury?
    Jupiter has a greater mass
  • How many atoms of carbon are shown in the formula?
    One
  • Which object has a stronger gravitational pull on the Earth?
    Object 1
  • Why are fossils great evidence of Continental Drift?
    Because the same fossils are found in different Continents.
  • What would happen to the gravitational strength as mass increases?
    Gravitational strength increases
  • Which object has a stronger gravitational pull on the Earth?
    Object 1
  • What is one way fossils provide evidence for Continental Drift Theory?
    Fossils of the same species are found on continents now far apart
  • What are asteroids mostly made of?
    Rock
  • What's the name of the Supercontinent that Alfred Wegener put together?
    Pangaea
  • What is the type of rock that is nonporous and does not allow water to pass through easily?
    Impermeable
  • What is the boundary between the unsaturated zone and saturated zone?
    Water table
  • What are the total atoms in the compound shown?
    24 Atoms
  • What is the type of rock that has pores that allow water to pass through easily?
    Permeable
  • What are 3 ways you can increase the rate of solubility?
    Increase temperature, agitation (shake or stir), and increase surface area (crush or break into pieces)
  • Which fossil is the youngest?
    Mammoth
  • 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
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