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monster
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star
Double points!
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fairy
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25
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baam
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15
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How do scientists know that some mountains were once at the bottom of an ocean?
Freshwater rivers flow to the ocean.
Marine fossils have been found on the peaks of some mountain
Saltwater fish are found in some mountain streams.
Dinosaur bones have been discovered in the mountains.
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15
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Which fossil is the youngest?
mammoth tusks
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lifesaver
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seesaw
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gift
Win 15 points!
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thief
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15
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The law of superposition finds the __________ age of rocks
relative
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Which is the most accurate method scientists use to predict the age of Earth?
investigating core samples from the Arctic.
radioactive dating of rocks
relative dating of rock layers
comparing the ages of different fossils
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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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What do earthquakes tell scientists about the history of the planet?
The continents of Earth are continually moving
Dinosaurs became extinct about 65 million years ago.
The oceans are much deeper today than millions years ago.
Earthâs climate is constantly changing
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type of rock formed through the cooling and solidification of magma or lava.
igneous
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True or False Tectonic plates are constantly moving at different rates and in different directions.
True
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Which rock layer is the oldest?
B
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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 weather conditions in the area of the bones
the index fossils 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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trap
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rocket
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rocket
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banana
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15
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What is A called?
an intrusion
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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 hold index fossils, which date the different ice cores
They show unconformities, which signal changes in deposition
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How old is the Earth?
4.6 Billion years
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