What is the primary material that makes up sedimentary rocks?, Crystallized magma, Metamorphosed crystals, Sediment, Liquid lava, Where does erosion typically move sediment to form these rocks?, High mountain peaks, The Earth's atmosphere, Inside active volcanoes, Low-lying areas like valleys and lake bottoms, Which of these acts as a "glue" to turn loose sediment into solid rock?, Dissolved substances in water that harden, The cooling of molten magma, Plant roots growing through the dirt, Extreme heat from the Earth's core, In an undisturbed stack of rock layers, where would you find the youngest layer?, At the very bottom, In the middle, At the very top, Scattered randomly throughout, What is the "actual age" of an object expressed in units of time called?, Relative age, Absolute age, Geologic age, Sedimentary age, Why is absolute dating typically used for igneous rocks rather than sedimentary ones?, They form new crystals with unstable particles that break down., They always stay at the top of the surface., Igneous rocks are softer., They are the only rocks that contain fossils., How long does it take for half of unstable potassium to break down into argon?, 76 million years, 10,000 years, 1.3 billion years, 500 million years, If a fossil is found in a rock layer with volcanic ash dated to 76 million years, how old is the fossil?, Much older than 76 million years, 1.3 billion years old, It is impossible to tell, 76 million years old, What can rocks and fossils tell us about Earth's past?, Past environments, organisms, and volcanic events, Only the age of the ocean, Nothing; they are just inanimate objects, The exact date the Earth will end.

Unit 2

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