A sample is a random, unbiased selection out of a larger group. An independent variable is one that is changed as to see how it will affect the dependent variable in an experiment.
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Primary succession starts with bare rock which is broken down by either lichen or moss to make soil while secondary succession starts with developed soil
Answer:
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Explanation:
Answer:
Crust- ranged from 6km to70km thick .
mantle- convection here leads to earthquakes.
Core -has a liquid and soild layer
Moho barrier- separates the crust and mantle.
Explanation:
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