SDSU Ocean 100 Final SacramentoGrilo Questions Updated To Pass
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Course
Ocean 100
Institution
Ocean 100
origin of earth - Correct Answer • Supernova: death of a star (great explosion)
• Supernova happened 4.6 bya, dust and gas flattens to a disk and spins faster due to gravity and solar nebula formed.
• Solar Nebula: describes formation of Earth 4.5 bya
• Nebula: gas cloud
ori...
SDSU Ocean 100 Final SacramentoGrilo
Questions Updated To Pass
origin of earth - Correct Answer • Supernova: death of a star (great explosion)
• Supernova happened 4.6 bya, dust and gas flattens to a disk and spins faster due to gravity
and solar nebula formed.
• Solar Nebula: describes formation of Earth 4.5 bya
• Nebula: gas cloud
origin of oceans - Correct Answer • volcanic explosion, H2O condensed and rained down for
thousands of years to create oceans
• icy comets hitting earth (responsible for 1/2 of earths ocean water)
origin of life - Correct Answer • 4.5 bya solar system formed
• about 4 billion years ago bacteria (in rocks)
• 2.5 bya photosynthetic organisms (algae) formed and put out O2 which lead to the
development of plants which put out O2 leading to development of animals
• 600 mya animals
earths internal layers - Correct Answer • lithosphere:
- outermost layer of earth
- first 100km of crust
- strong, rigid, brittle
- contains all the crust and outermost layer of the mantle
,• asthenosphere:
- plastic, 600km
- upper mantle
- very hot
- allows plates to move over it
-ductile
- directly below lithosphere
Energy - Correct Answer • kinetic: energy of motion
• heat: movement from hot to cold
- sources → sun, geothermal (heat from within the earth)
• kinetic + heat energy drive everything that happens on the surface of the earth
density - Correct Answer • the relationship between mass and volume
• colder water = more dense (molecules closer together)
- thermal contraction
- polar & sub polar regions
- lower energy
• warmer water = less dense (molecules are farther part)
- thermal expansion
- equatorial & sub equatorial regions
, - high energy
• oceanic crust (basalt) denser than continental crust (granite)
convection - Correct Answer • movement of liquid, gas, & viscous solid
• hot, less dense air/water rises
•cold, more dense air/water sinks
bioaccumulation - Correct Answer • the build up of a substance (usually a toxin) as it passes
through a food chain
• top of the food chain has most concentration of substance (mercury for example)
biodegradation - Correct Answer • the breaking down of dead organic matter by living
organisms such as bacteria
• biodegradable → nature can break it down
photo-degradation - Correct Answer a polymer that can be broken down by the sun (like
plastic)
diffusion - Correct Answer • movement of molecules from an area of higher concentration to an
area of lower concentration
• oxygen enters fishes gills at a high concentration from water to low concentration in their blood
plate tectonic principles (evidence?) - Correct Answer 1. continental drift
• pangea (super continent during early years of Earth)
• break up of continent → asthenosphere melts & pushes land apart
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