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Science Midterm
| Question | Answer |
|---|---|
| What is a p wave? | A primary wave, push and pull, comes first |
| What is a s wave? | A secondary wave, side to side, comes second |
| What is a surface wave? | Goes up and down, does most destruction, comes last |
| What is Pangaea? | A super continent |
| What is the most common theory? | Impact theory |
| What is a lunar month? | 29.5 days due to moons revolution around Earth |
| What is the capture theory? | During solar systems formation a large object was captured by earths gravity |
| What is the simultaneous formation theory? | Moon and Earth formed at the same time with the same materials |
| What is mare aka Maria? | Ancient craters filled by volcanic eruptions , appear dark, 50% of earths surface |
| What are rilles? | Long, curving, cracks filled with dust, look like riverbeds (lava tubes) |
| What are craters? | Bowl shaped depression formed from impact of meteorite |
| What are rays? | Bright streaks radiating from craters |
| What is regolith? (Lunar Soil) | Ground up rock material made by smashing impact of meteorite |
| What are highlands? (Lunar Mountains) | Located on rims of Maria, light in color, heavily colored craters |
| What are the geological eras? | Precambrian, Paleozoic, Mesozoic, Cenozoic |
| What is tephra? | Ash, dust, blocks, bombs, lapilli |
| What is a half life? | The amount of time it takes for a quantity to fall half in its value (decay) |
| What is an inconformity? | Missing layers, caused by erosion |
| What is uranium 238? | Most common isotope used to determine age of anything 500,00 years old or less |
| What is Carbon 14? | Used in determining the age of ancient organic, geological, or archaeological |
| What do dendrologist study? | The age of tree rings (can tell weather) |
| What is the age of the earth? | 4.6 billion years old |
| What causes the formation of the earths crust? | Made of sedimentary, metamorphic, and igneous rocks |
| What is outgassing? | Release of gas that has dissolved, trapped, or frozen |
| What is a trace fossil? | Footprint, coprolites, and egg shells |
| What is mold/cast? | Hollowed out impressions or where the mold is filled in |
| What is an altered hard part? | Very uncommon for complete remain to exist |
| What is original preservation? (the whole thing) | La Brea tar pits, insects in amber, mummification, and freezing |
| What is cyanobacteria? | Phylum bacteria that obtain energy through photosynthesis |
| Name the phases of the moon | New moon, waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, third quarter, waning gibbous |
| Describe mafic | Low silica, high fe and mg |
| Describe felsic | High silica, low fe and mg |
| What causes an earthquake? | Caused by movement along gigantic fractures in earths crust |
| What is shear? | Stress that causes a material to twist |
| What is tension? | Stress that pulls a material apart |
| What is a fault? | A fracture along which movement occurs |
| What is ductile deformation? | Deformation of materials in response to stress |
| What are seismic waves? | Vibration of the ground during an earthquake |
| What is a seismometer? | An instrument that detects and records seismic waves |
| What is an epicenter? | The point on earths surface directly above the focus |
| What is a focus? | The point underground where an earthquake originates |
Created by:
KJohnson23
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