Oceanography 100 Final SDSU Exam Questions And Answers 100% Verified

Oceanography 100 Final SDSU Exam Questions And Answers 100% Verified How was the solar system formed? - answer-a supernova (explosion of a start when it runs out of fuel) -4.6 billion years ago how was the earth formed? - answer-a nebula made of gas and dust -was formed 4.5 billion years ago how did oceans form? - answer-A volcanic expulsion - rained for thousands of years -hit by an icy comets -volcanic out gassing and ice from comets when did life form? - answer-3.7 billion years ago how long have animals been around for? - answer-600 million years ago how long has photosynthetic organisms been around? - answer-2.5 billion years ago what is the lithosphere? - answer-crust and top mantle -outer most layer of the earth -the ground on which we walk on -(rigid and brittle) -(100km) What is the asthenosphere? - answer-beneath the lithosphere -where convection is thought to occur -(hot, plastic region, 600km) what is the mesosphere - answer-outer core, inner core -(lower mantle) -core is made of Iron and nickel what is the order of the earth layer (from outer most to inner most) - answer1. Lithosphere (ridge) 2. Asthenosphere (plastic) 3. Mesosphere (ridge) 4. Outer core (liquid) 5. inner core (rigid) What is kinetic energy? - answer-Energy of motion what is heat energy - answer-Energy transfer of heat from hot to cold what is density? - answer-relationship between mass of a substance/how much space it takes up -when it is colder it is more dense -when it is warmer it is less dense what is the difference between oceanic crust and continental crust - answer-oceanic crust is (basalt) thinner and more dense -continental crust (granite) is thinker and less dense what is convection - answer-means of heat energy transfer -sinking of cold air because it is denser -rising of hot air because it is less dense Bioaccumulation - answer-as you go up the base of the food chain, the level of mercury is more concentrated at the top of the food chain than the base of the food chain -ex) bigger fish eat smaller fish with contamination -(little fish is contaminated, then bigger fish is contaminated because he ate little fish) Biodegradtion - answer-Process by which organic substances are decomposed by microorganisms -(plastic is NOT biodegradable) -nature can break it apart and can be used again photo-degradation - answer-when the sun breaks things down to make them smaller