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How do scientists know that some mountains were once at the bottom of an ocean?
Saltwater fish are found in some mountain streams.
Freshwater rivers flow to the ocean.
Marine fossils have been found on the peaks of some mountain
Dinosaur bones have been discovered in the mountains.
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15
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To learn how Earthโs Atmosphere has changed over time, scientists study air bubbles in what?
ice cores
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heart
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shark
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fairy
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thief
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This law that states that older rocks are at the bottom and younger rocks are on top is called...
law of superposition
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Which fossil is the youngest?
mammoth tusks
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A scientist finds the bones of a dinosaur. What could help the scientist determine the approximate age of the dinosaur bones?
the index fossils in the area of the bones
the weather conditions in the area of the bones
the kinds of trees living in the area of the bones
the birds living in the area of the bones
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Which is the most accurate method scientists use to predict the age of Earth?
radioactive dating of rocks
comparing the ages of different fossils
relative dating of rock layers
investigating core samples from the Arctic.
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What is A called?
an intrusion
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Which allows scientists to investigate what Earthโs climate was like over the past 740,000 years?
ice cores
fossild
faults
volcanic deposits
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Which best describes how ice cores are important to the study of geologic history?
They contain evidence showing changes in the atmosphere
They show unconformities, which signal changes in deposition
They hold index fossils, which date the different ice cores
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15
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What do you call the supercontinent landmass formed million years ago?
Pangea
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shark
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What drives the process of plate tectonics?
Heat of the Earth, convection currents
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magnet
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gift
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type of rock formed through the cooling and solidification of magma or lava.
igneous
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