Semester Reteach Review

Semester Reteach Review

Convection Currents

Magma in the mantle heats up, becomes less dense (lighter) and rises. It pushes the Earth's plates, cools, and sinks back down. This process occurs again and again.

HR Diagram

The HR Diagram classifies stars. As you go up the Y axis, the stars get brighter. As you move along the X axis, stars get cooler as you move from left to right. Observe the diagram.

Multiple Choice

Which group is the dimmest (not bright)?

• Giants

• Super giants

• main sequence

• white dwarfs

Continental Drift Theory by Alfred Wegener

Wegener had evidence that pangaea existed but couldn't explain why the continents were moving!

Plate Boundaries

Convergent = folded mountains, deep ocean trenches and volcanoes

Divergent = mid ocean ridges (volcanoes) and rift valleys

Transform = Fault lines

Topographic Maps

Contour lines show elevation above sea level. To find the difference in elevation you must find the elevation at each point and subtract the two.

Multiple Choice

Observe the image. What is the difference in elevation between the 2 points?

• 160

• 40

• 250

• 200

Seasons

To determine seasons for the hemispheres, just look at the direction the axis is tilted. If it is tilted towards the Sun, it will have summer. If tilted away, it will be winter.

Moon Phases

Phases in order: New moon, waxing crescent, 1st quarter, waxing gibbous, full moon, waning gibbous, 3rd quarter, waning crescent

Multiple Choice

Where would we find a full moon?

• Near the sun

• Far from the sun

Multiple Choice

Which way does the moon revolve?

• Clockwise

• Counter-clockwise

Multiple Choice

Which point would there be a full moon?

• 1

• 3

• 5

• 7

Multiple Choice

Which hemisphere is having summer?

• Northern

• Southern

Multiple Choice

Which point would there be a full moon?

• 1

• 3

• 5

• 7

Competition

Organisms who eat the same food source will compete

In this food web the fox and owl will compete for the rabbits.

Plant competition

Plants will compete for things like sunlight, soil space, and water.

Insecticides and pesticides

These chemicals can cause a decrease in population to the organisms that eat plants.

Ex: Grasshoppers and butterflies can get sick and die from these chemicals.

Multiple Choice

Observe the image: The seagull will compete with who for the prawn?

• Fish

• zooplankton

• Mussels

Multiple Choice

Observe the image: Which statement is true if the prawn population becomes extinct?

• The fish population will increase

• The seagulls will die off completely because they have nothing left to eat

• The zooplankton population will increase while the fish population will decrease

Multiple Choice

Observe the image: how would this food web be effected if there was no sunlight?

• Everything would remain the same

• Plants would not survive, therefore the whole food web would be effected.

• Some organisms would survive while others would not