ALL ABOUT WHALES!
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An ice age is a time lasting thousands of years during which the Earth is very cold and largely covered by ice and glaciers.
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.
Ichthyosaurs were prehistoric reptiles that lived in the sea.
When molten rock cools, igneous rock is formed.
Impact craters are the remains of collisions between an asteroid or meteorite and the Earth.
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 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 is competition between two different species of organisms (competing for food, territory, etc.).
Intraspecific competition is competition among members of a species (competing for food, mates, territory, etc.).
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 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.
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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