Whale Glossary
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Whale Glossary |
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 Ice Age An ice age is a time lasting thousands of years during which the Earth is very cold and largely covered by ice and glaciers. |
  Ichnofossils Also known as trace fossils, these are fossilized footprints, nests, dung, gastroliths, etc., but not actual body parts. Ichnofossils record the movement and behavior of animals. |
 Ichthyosaur Ichthyosaurs were prehistoric reptiles that lived in the sea. |
 Igneous rock When molten rock cools, igneous rock is formed. |
 Impact crater Impact craters are the remains of collisions between an asteroid or meteorite and the Earth. |
  Index fossils Index fossils are commonly found fossils that are limited in time span. They help in dating other fossils. For example: trilobites were common during the Paleozoic, but not found before the Permian period, and ammonites were common during the Mesozoic Era, but not found after the Cretaceous period. |
  INSECTS Insects have exoskeletons and six legs. They evolved during the Silurian Period, 438 to 408 mya, long before dinosaurs or whales existed. |
International Whaling Commission The International Whaling Commission regulates the hunting of whales in order to help the many endangered species of baleen whales. |
INTERSPECIFIC COMPETITION Interspecific competition is competition between two different species of organisms (competing for food, territory, etc.). |
INTRASPECIFIC COMPETITION Intraspecific competition is competition among members of a species (competing for food, mates, territory, etc.). |
  INVERTEBRATE Invertebrates are animals without a backbone. Some invertebrates include protozoans, arthropods (insects, arachnids, crustaceans, etc.), worms, jellyfish, sponges, mollusks (like cephalopods [octopus], gastropods, bivalves [clams, oysters, scallops]), and many others. |
Iridium anomaly Iridium is an element that is rare on the Earth's surface, but abundant on chondritic meteors. The presence of excess Iridium at the K-T layer (the Iridium anomaly) supports the Alvarez asteroid theory. |
 Isotope An isotope of an element is another form of the same element, that has a different number of neutrons in the nucleus (giving it a different atomic weight). |
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Whale Glossary |
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