______ are sheetlike intrusive igneous bodies that form when magma is injected i

Question

______ are sheetlike intrusive igneous bodies that form when magma is injected into fractures that cut across rock layers. A(n) _______ can be defined simply as an aggregate of minerals. _______ Muscovite is an important mineral in peridotites and other ultramafic rocks. ______ The most common extrusive igneous rock is granite. ______ Granite is a classic example of an igneous rock that exhibits a coarse-grained texture. _______ Igneous rocks are the rock type most likely to contain fossils. _______ Because magma's density is greater than the surrounding rocks, it works its way to the surface over time spans from thousands to millions of years. ______ According to Bowen's reaction series, quartz is often the last mineral to crystallize from a melt. _______ Magmas that produce basaltic rocks contain more silica than those that form granitic rocks. ______ Located at the summit of most volcanoes is a steep-walled depression called a sill. _______ Dikes are tabular, discordant plutons. _______ Slow cooling of a magma results in the formation of small mineral crystals Describe the cooling histories implied by the following textures: glassy, aphanitic, phaneritic, porphyritic. How would you distinguish, on the basis of minerals present, among gabbro, diorite, and granite? Moving crustal plates and earthquakes are powered by: heat from the sun heat flowing from the earth's interior differences in density in the earth's crust expanding gases from the earth's interior expansion and contraction from heating and cooling The crust and the uppermost mantle is:

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SOLUTION:-

Dykes are tabular, discordant igneous bodies produced when magma is injected into fractures that cut across rock layers. Dike intrusion is a process where magma within a tabular-shaped body ascends upward into or moves laterally within the earth’s upper crust. Distinct deformational landforms result from dike intrusion, including aligned basaltic vents, fissures, and, in some cases, sets of tension cracks, monoclines, and small normal faults that form small grabens. Where magmatic dikes intersect the surface, they erupt to form spatter cones, eruptive fissures, low shield volcanoes, and lava flows.

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