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B) Metamorphic; The rock separated into layers as it was cooked and squeezed deep in a mountain range.C) Sedimentary; The layering was caused by changes in the flow velocity of the river that deposited the materialD) Igneous; The layers were caused by flow processes during the eruption that released this.E) Marmot #2Feedback: The large crystals, intergrown nature, and separate dark and light layers all point to metamorphism, deepinside a mountain range. Rapid cooling in volcanic eruptions gives tiny crystals, not the big, pretty ones here. You cansee the former sand grains or other-sized pieces in sediment and sedimentary rocks. And marmot doo-doo consists ofsmall, dark pellets, akin to big rabbit doots, and usually isn’t considered to be rock.8.Points Earned:1.0/1.0Correct Answer(s):BPoints Earned:1.0/1.0Correct Answer(s):B
14-9-29 10:22RockOn #4第6 （共9 ）A 100-foot-high tsunami wave nearly kills you in your boat. It is likely that:have been 100 feet high.ocean but get shorter when damped by the friction in shallow water near the shore.water of the central ocean, but pile up to become high when slowed by the friction in shallow water near the shore.high when nearing the shore.9.Tsunamis:warnings to save many lives.Feedback: Because tsunamis are triggered by earthquakes, among other things, and we cannot predict earthquakesaccurately, we cannot make months-in-advance predictions of tsunamis. The p-waves from the earthquakes that causethe most common tsunamis move more rapidly than the tsunamis do, allowing timely warnings; however, because thetsunamis get where they are going in hours or less typically, not much time is available. Water does go out beforerushing in along some coasts, but comes in before going out along other coasts, waves have “up” and “down” parts, andsome coasts get an “up” first while other coasts get a “down” first. Little earthquakes make little tsunamis; bigearthquakes make big tsunamis.