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ignimbrite Ignimbrite (meaning "fire rain stone") is a type of igneous rock that is formed in the pyroclastic flow (the pumice flow deposit) of violently explosing volcanoes. Ignimbrite forms as molten lava and ash fuse; this rock is streaked with parallel bands of black glass. The texture of ignimbrite varies from hard to soft. |
impact crater Impact craters are the remains of collisions between an asteroid or meteorite and the Earth. |
index fossil 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. |
intertidal zone The intertidal zone is where the sea meets the land. |
intrusive igneous rock Intrusive rocks are igneous rocks that have formed (and cooled slowly) beneath the surface of the Earth. These rocks usually have a coarse-grained or medium-grained texture, like granite. |
ion An ion is an atom that is missing one or more electrons; ions have an electrical charge. |
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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