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Science Test: Fossil

This is for Mrs. Nguyen's class, about fossils and different periods in time

TermDefinition
Trace Fossil: These fossils form when things an animal left behind is preserved. Some examples are footprints, animal burrows, tooth marks, and feces. They can show us how the animal used to live.
Mold Fossil: These fossils are body fossils. They form when the organism dies, causing an imprint in sedimentary rock. It leaves a cast.
Resin Fossil: These fossils cause the ENTIRE organism to be preserved. Fossils like this are very rare. Resin will consume and cover the animal, or insect. The resin turns into a substance called amber. This makes it look like the creature is frozen in time, or ice.
Body Fossil: These fossils form when part of a body and organism are preserved in sediment.
Mass Extinction: A mass extinction is when many species of animals go extinct in a short period of time. Although this is a “short” period of time, it actually means several million years on the time scale.
Ordovician Period: Mass extinction number one was at the end of the Ordovician period. A big ice age caused this, and a large sheet of ice covered the earth. As ice froze, it deprived the earth of accessible water. 85% of marine life perished.
Devonian Period: There was another mass extinction at the end of the Devonian period. No information about this time was given in the article.
Permian Period: The largest extinction in history, the Permian extinction killed 90% of all life on earth. Some think that a volcanic eruption in Siberia caused this, which meant that the lava produced at this time was large enough to cover the U-S of A. Flow of water in
Triassic Period: At the end of the Triassic period, there was an extinction. No information about this time was given in the article.
Cretaceous Period: The Cretaceous extinction is perhaps the most famous. We owe it credit to wiping out the dinosaurs. Most likely, a meteor 10 kilometers large struck the earth in the Yucatán Peninsula in Mexico. The large collision of the large rock caused firestorms that
How was oxygen made for the Earth: After the Cambrian Explosion, oxygen was brought to earth.
Cambrian Explosion: The Cambrian Explosion took place 540 million years ago. Radiation was exposed to the environment which caused the biodiversity to increase very quickly. This is called adaptive radiation. It resulted from the change in the ocean to make more available ha
Geologic Time Scale: A time scale showing the different periods, eras, and eons in the history of the earth.
Nebular Hypothesis: The hypothesis that a cloud of dust, or nebula formed our solar system.
How the Core Formed: The hypothesis that a cloud of dust, or nebula formed our solar system.
Iron Catastrophe: It improved the amount of rock on the earth.
Formation of the Moon: A large dwarf planet hit the earth, causing the debris to float around the earth and form into the moon.
Giant Impact Hypothesis: It explains how the moon was formed.
How Oxygen was Made for the Earth: After the Cambrian Explosion, oxygen was brought to earth.
Burgess shale: It’s a rock. It’s smooth on top and Used for fossils.
When did Pangea begin to form; About 335 million years ago.
Iridium Layer: The amount of iridium in rock layers.
Explain how the asteroid caused a mass extinction: The large collision of the large rock caused firestorms that blocked the sun, causing plant numbers to decrease. Without a source of food, many animals died if they didn’t perish to the hands of volcanic activity in the end.
Created by: 25assarid
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