RocksOnline version Study guide of rocks by Courtney Bezdek 1 Pluton is a small, irregular shaped body. Yes No 2 Intrusive rocks are igneous rocks that are fine grained Yes No 3 Fissure are when lava eruprts or flows from long cracks in the Earth's surface. Yes No 4 Sheet-like intrusions that are parallel to older rock formations are sills. Yes No 5 Lava flowing out of fissures on the land causes a new ocean floor to be formed. Yes No 6 A finer texture in igneous rocks is caused by a quicker cooling rate. Yes No 7 Mafic rocks are rich in calcium, iron, and magnesium. Yes No 8 Metamorphic rocks begin as magma. Yes No 9 Metamorphic rocks sometimes remain solid when they form. Yes No 10 Shale is a sedimentary rock made up of layers of clay Yes No
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