Physics, 30.04.2021 01:40 maritsaledesma

What do geoligists use to mark divisions in geologic time? No Files or links. 8th Grade Please help asap. A- Abrupt changes in the fossil record

B- Frequent episodes of climate change

C- movements of Earth's tectonic plates

D- Rates of radioactive mineral decay

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What do geoligists use to mark divisions in geologic time? No Files or links. 8th Grade Please help...