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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.
Dinosaur bones have been discovered in the mountains.
Marine fossils have been found on the peaks of some mountain
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15
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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 rock layer is the oldest?
B
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seesaw
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magnet
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fairy
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baam
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Fossils that help determine the relative age of rocks around it are called
index fossil
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The law of superposition finds the __________ age of rocks
relative
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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 kinds of trees living in the area of the bones
the birds living in the area of the bones
the index fossils in the area of the bones
the weather conditions in the area of the bones
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What do you call the supercontinent landmass formed million years ago?
Pangea
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Which fossil is the youngest?
mammoth tusks
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seesaw
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rocket
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gift
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baam
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What type of rock are you most likely to find fossils in?
Sedimentary Rock
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What drives the process of plate tectonics?
Heat of the Earth, convection currents
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boom
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gold
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fairy
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thief
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How old is the Earth?
4.6 Billion years
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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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