8th Grade Review SLO
How is a sea arch formed?
Mechanical weathering from waves.
What does it mean when the lines on a contour map are far apart?
It is a gradual slope
What does it mean when the lines of a contour map are close together?
Steep slope Steep slope
When magma hardens to create a string of volcanoes, what kind of process is this? Constructive or destructive?
CONSTRUCTIVE
What impact would friction have on a kid going down a slide?
It would slow the child down
Is there movement with an unbalanced force?
Yes movement = unbalanced force
What is the net force of 1000 left and 3000 right?
2000 right
What is the net force of 2000 right and 2000 left?
O N- Balanced-no movement
How does distance affect field strength?
There is more force when the objects are closer…a decrease in distance is an increase in force.
What happens when an object enters a gravitational field?
The object is affected
What would cause a compass to move as it gets closer to the electromagnetic field?
Magnetism is created by an electric current
Vinegar and baking soda mix to release what kind of energy?
Thermal energy
Where is gravitational potential energy the greatest on a roller coaster?
The top of the first hill
When is elastic potential energy the greatest with a rubber band?
When it is stretched the furthest
Where does indirect evidence about the layers of the earth mostly come from?
Seismic waves(from earthquakes)
What is the inner core of the earth made of(state of matter and material)?
Iron rich solid
As you go deeper into the Earth, describe the density of the layers.
The deeper you go into the Earth the more dense the layers are
When two identical fossils are found on different continents, what can you conclude?
The continents were once joined
If you see layers with fossils like this: Fish_____ Shell_____ Oak leaf__ Fern_____ What was replaced by the sea?
The forest was replaced by the sea
What causes the tectonic plates to move?
Convection currents
How do convection currents move? What direction?
What/where is the energy source for tectonic plate movement?
Heat from the inner core
What is the cause of tectonic plate movement?
Convection currents in the asthenosphere
Where are volcanoes most likely to form?
Near the edges of the tectonic plates
When you see a tectonic plate diagram with arrows moving in opposite direction past each other. What is the name of this boundary? What could this movement cause?
Transform boundary Earthquake
Describe this boundary
Convergent
Divergent
What layer do the tectonic plates float on?
The asthenosphere
The law of superposition states that the oldest rock is where?
On the bottom
If you say an Earth layer is older or younger, you are determining____________ age.
Relative
If an intrusive rock cuts through all the layers, what can you conclude about it’s relative age?
It is the youngest, it had to come last
In an experiment, what is the one thing you change?
Independent variable
In an experiment, what is measured or changes as a result of changing the independent variable?
The dependent variable
Name the physical layers of the Earth from least dense to most dense.
Lithosphere Asthenosphere Mesosphere Outer core Inner core
What is the difference between weight and mass? (4 points)
Weight is a measure of gravity Weight can change from place to place Mass is a measure of matter Mass doesn’t change unless you add or subtract from it.