SDSU Ocean 100 Final SacramentoGrilo Exam Questions And Answers 100% Verified

SDSU Ocean 100 Final SacramentoGrilo Exam Questions And Answers 100% Verified Origin of earth - 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 - 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 - 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 - 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 • mesosphere: - lower mantle - outer core (liquid) + inner core (rigid) Energy - 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 - 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 - answer• movement of liquid, gas, & viscous solid • hot, less dense air/water rises •cold, more dense air/water sinks bioaccumulation - 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 - answer• the breaking down of dead organic matter by living organisms such as bacteria • biodegradable → nature can break it down photo-degradation - answera polymer that can be broken down by the sun (like plastic) diffusion - 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?) - answer1. continental drift • pangea (super continent during early years of Earth) • break up of continent → asthenosphere melts & pushes land apart 2. echo sounding & sonar • shallowest in the middle of oceans 3. seafloor spreading • mid-ocean ridges • rocks rise from center &