are ancient remains or traces of organisms that have turned into rock., Fossils, are scientists who study fossils., Paleontologists, form when organisms get trapped in tree sap that hardens into amber, preserving them in their original form., Amber fossils, are organisms preserved in ice or snow, keeping their original form., Frozen fossils, form when an organism leaves a hollow space (mold) in rock, and minerals fill it to make a copy (cast)., Mold and cast fossils, are marks or prints left by organisms in soft surfaces like mud, which later harden into rock., Imprint fossils, form when minerals replace the inside of a dead tree or animal, turning it into stone., Stony fossils, is an adjective that describes wood or bones that have turned into stone., Petrified, is the entire history of Earth. starting when it formed about 4.6 billion years ago. Scientists divide it into different time periods, like chapters in a book. They study rocks, fossils, and Earth's layers to learn what happened in each time period., Geologic time, are natural energy sources like coal, oil, and natural gas, formed millions of years ago from the remains of buried plants and animals., Fossil fuels, are useful natural materials that take millions of years to form, so they cannot be replaced easily. For example, soil, minerals, rocks, uranium, plutonium and fossil fuels (like coal, oil, and natural gas) are nonrenewable resources., Nonrenewable resources, are useful natural materials that can be replaced quickly in nature. For example, bioresources (like plants & animals) sunlight, water, wind, and underground heat are renewable resources., Renewable resources, are energy sources that are alternatives to fossil fuels (like coal, oil, and natural gas). Alternative energy sources are: Biomass (biomass energy), wind (wind energy), sun (solar energy), flowing water (hydroelectric energy), tides (tidal energy), underground heat (geothermal energy), uranium & plutonium (nuclear energy)., Alternative energy sources.

Unit 3

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