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7th Grade DCA 3 Review
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Which line on the graph show the object stopping and returning back to starting position?
The mult color line
What are the total atoms in the compound shown?
24 Atoms
How many atoms of carbon are shown in the formula?
One
What is the amount of a substance (solute) present in a specific volume of solution?
Concentration
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)
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.
What is the type of rock that is nonporous and does not allow water to pass through easily?
Impermeable
What is the type of rock that has pores that allow water to pass through easily?
Permeable
What is the boundary between the unsaturated zone and saturated zone?
Water table
What are layers of impermeable rock in the ground that hold groundwater?
Aquifer
Convection currents occur where in the Earth?
Mantle
What two factors affect gravitational strength?
Mass and distance
How would an object increase gravitational strength? Looking for two things.
Increase mass and decrease distance
The Earth's surface is made up of more than 2/3 of what?
Water
Which object has a stronger gravitational pull on the Earth?
Object 1
Which object has a stronger gravitational pull on the Earth?
Object 1
In sedimentary rock layers, how do we know which fossil is the oldest?
It's at the bottom.
In sedimentary rock layers, how do we know which fossil is the youngest?
It's at the top.
Which fossil is the youngest?
Mammoth
Which fossil is the oldest?
Trilobite
Seafloor Spreading supports what theory?
Plate Tectonics Theory
Fossils support what theory?
Continental Drift Theory
Why are fossils great evidence of Continental Drift?
Because the same fossils are found in different Continents.
Why does an object weigh less on the Moon than on Earth?
The Earth has more mass than the moon
What keeps satellites in orbit around Earth?
Gravity
What would happen to the gravitational strength as mass increases?
Gravitational strength increases
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
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
Why don’t asteroids fall into the Sun?
Gravity keeps them in orbit
What can scientists learn from fossils of tropical plants found in Antarctica?
Antarctica was once a warm continent
Evidence of __________ spreading shows that new crust is forming and plates are moving apart.
Seafloor
What drives the movement of tectonic plates?
Convection currents in the mantle
What is one way fossils provide evidence for Continental Drift Theory?
Fossils of the same species are found on continents now far apart
What's the name of the Supercontinent that Alfred Wegener put together?
Pangaea
What happens to gravitational pull if the distance between two objects doubles?
It decreases
What keeps planets orbiting the Sun?
Gravity
Why does Jupiter have stronger gravity than Mercury?
Jupiter has a greater mass
Where is the asteroid belt located?
Between Mars and Jupiter
What are asteroids mostly made of?
Rock
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