2007-10-23 15:11:13 · 3 answers · asked by that_chick_from_myspace 2 in Science & Mathematics ➔ Earth Sciences & Geology
Igneous rocks are formed when a part of the earth melts from volcanic activity. When they are cool they appear as rocks, often with many chemicals in them. It the cooling was at such a slow rate that some of those chemicals could crystallize that is the origin of those crystals. Geodes are the ones with lots of beautiful crystals inside a hollow igneous rock.
2007-10-23 15:16:17 · answer #1 · answered by Rich Z 7 · 1⤊ 0⤋
Igneous rocks are formed when magma (or molten rocks) are released to the surface of the earth. It is usually found near hotspots, particularly volcanoes. Igneous rocks are formed through the cooling of magma. Through time, magam cools and solidifies forming igneous rocks. Igneous rocks are generally black (but some are light-colored) and they have this rough (or sometimes smooth depending on how they are formed) texture.
2007-10-23 16:04:21 · answer #2 · answered by Anonymous · 2⤊ 0⤋
the magma released from volcanos and cooled over time is an ignaceous rock. the crystal structures slowly come into play over millions of years of cooling down.
2007-10-23 15:37:38 · answer #3 · answered by avkedav 3 · 3⤊ 0⤋