Which of the following is an example of a geologic process that typically changes Earth's surface very slowly over millions of years?, A sudden landslide, Tectonic plates moving a few centimeters each year, A meteorite impact, A volcanic eruption, How do scientists use the present to learn about Earth's geologic past?, They assume that past geologic processes were completely different from today's., They study current processes like weathering and erosion to understand how landforms were shaped in the past., They only look at man-made structures to determine Earth's age., They ignore current volcanic activity., What was a major consequence of the meteorite that struck the Yucatan Peninsula 65 million years ago?, It caused the Appalachian Mountains to grow taller., It blocked sunlight for years and likely contributed to a mass extinction., It created a U-shaped valley instantly., It slowed down the movement of tectonic plates, Compiling Evidence of Earth's Past, A list of the most famous mountains in the world, A compilation of all of Earth's known rocks that provides clues about the past., A collection of rocks only found in Yellowstone National Park, A method used only to date human artifacts., How can a layer of volcanic tuff be used as a "benchmark" in the rock record?, It shows that the area was always a desert, It can be given an absolute date, helping to determine the ages of surrounding rocks and fossils., It is the only type of rock that contains fossils, It proves that tectonic plates never move., What does the presence of shark teeth in a rock layer in Kansas indicate?, Sharks once lived on land in the Midwest., A sea once covered that part of Kansas about 89 million years ago, Volcanic eruptions carried the teeth there from the ocean., Kansas has always been a dry, landlocked environment., Why are the divisions in the geologic time scale (eons, eras, periods) not equal in length?, Scientists made a mistake when measuring time., They are based on major events like mass extinctions rather than a set number of years., The Earth's rotation used to be much faster, A clock was used to measure them originally., Approximately what percentage of Earth's 4.6-billion-year history is taken up by Precambrian time?, 10 percent, 90 percent, 50 percent, 25 percent, In which division of geologic time do we currently live?, The Jurassic Period, The Holocene Epoch, The Paleozoic Era, The Cretaceous Period

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