Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Earth Science
Second Semester review
| Question | Answer |
|---|---|
| List four layers of the earth | Inner core, outer core, lithosphere, asthenosphere |
| Three sources of earth's internal heat | Heat from earlier earth formation, radioactive decay of isotopes in mantle, radioactive decay in rocks of earth's crust |
| How to determine age of radioactive material | figure out the half life of a material, then count the number of decayed atoms. determine what fraction of the total this. |
| What drives plate tectonics? | Convection of currents of lava in the mantle. |
| Convection is the transfer of energy by the movement of heated matter. What effect does this have on the matter? | Heating matter causes expansion and decrease in density. |
| What happens at a divergent boundary as a result of convection currents? | the lithosphere is lifted and split |
| What happens at a convergent boundary as a result of convection currents? | The crust pulls downward and sinks |
| What three pieces of evidence did Alfred Wegener use to support his theory of continental drift | Ancient climate evidence, data on ancient reptiles and ferns, evidence from rock formation. |
| Why did other scientist disagree with Alfred Wegener? | He could not explain how or why the continents moved |
| Which theory explains why the Earth's crust and rigid upper mantle move in different directions at different rates over the Earth's surface. | Plate tectonics |
| What is the evidence that supports the Plate tectonics theory? | 1.Magnetic reversals on the ocean floor are mirror images on either side of ocean ridges 2. Oceanic crust is newer near ocean ridges. 3. Thickness of ocean floor sediment increases with distance from ocean ridges. |
| What type of rock is oceanic crust composed of? | Basalt |
| What type of rock is continental crust composed of? | Granite |
| What happens at divergent boundaries? | Plates move apart |
| What happens at convergent boundaries? | Plates come together |
| What happens at transform boundaries? | Plates slide past each other |
| What is formed at continental-continental plate boundaries? | Mountain ranges |
| What is formed at a divergent boundary on the ocean floor? | New ocean crust |
| What is formed at a divergent boundary of continental crust? | A rift valley |
| What happens when an oceanic and continental crust converge? | A trench and a mountain range with many volcanoes |
| What does not occur at transform boundaries? | Volcanoes |
| How is the amount of energy released by an earthquake measured? | Magnitude |
| Each whole number increase on the Richter scale corresponds to a 32 fold increase in what kind of energy? | Seismic energy |
| What scale measures an earthquake's intensity? | Modified-Mercalli scale |
| Where is an earthquake's intensity is usually the greatest? | at the epicenter |
| What factor can determine the strength of an earthquake? | The depth of the focus |
| What type of waves cannot travel through liquids? | S-waves |
| What type of data from earthquakes has given information on the structure of the earth's core? | Primary and secondary waves |
| What layer is the youngest in a core sample of the earth? | Top layer is youngest |
| What law describes the age of various layers in the bisection of the earth? | Law of superposition |
Created by:
ballengere
Popular Earth Science sets