- intrusive landform
- one produced by the cooling of magma into solid igneous rock within the crust.
Geography Dictionary & Glossary for Students \\ ITS Tutorial School (ITS) - Hong Kong.
intrusive landform
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intrusive — Denoting igneous rocks derived from molten matter (magmas) that invaded pre existing rocks and cooled below the surface of the earth. Compare: extrusive. HP … Glossary of landform and geologic terms
dike — [ intrusive rocks ] A tabular igneous intrusion that cuts across the bedding or foliation of the country rock. Compare: sill. GG … Glossary of landform and geologic terms
sill — (intrusive rocks) A tabular, igneous intrusion that parallels the bedding or foliation of the surrounding sedimentary or metamorphic rock. Compare: dike. GG … Glossary of landform and geologic terms
igneous rock — Rock formed by cooling and solidification from magma, and that has not been changed appreciably by weathering since its formation; major varieties include plutonic (i.e., intrusive) and volcanic (i.e., extrusive) rocks. Examples: andesite,… … Glossary of landform and geologic terms
extrusive — (adjective) Said of igneous rocks and sediments derived from deep seated, molten matter (magma), deposited and cooled on the earth s surface (e.g., including lava flows and tephra deposits). Compare: intrusive, volcanic. HP … Glossary of landform and geologic terms
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