Basaltic Rocks Make Up Most Of The Sea Floor True False

Basalt is clearly the most common volcanic rock on earth and basaltic rocks including gabbro diabase and their metamorphosed equivalents are the most common rocks in the crust 2 basalt is also common on the moon and other rocky planets of the solar system.

Basaltic rocks make up most of the sea floor true false.

True t f lignite and bituminous coals are sedimentary rocks. Basalt extrusive igneous volcanic rock that is low in silica content dark in color and comparatively rich in iron and magnesium. The crust overlies the solidified and uppermost layer of the mantle the crust and the solid mantle layer together constitute oceanic lithosphere. Basalts at oceanic divergent boundaries.

True t f glassy igneous rocks form when magma cools too fast for mineral grains to grow. Basalt is a major rock type that occurs in virtually every tectonic setting. This hot rock melts as the divergent boundary pulls apart and the molten rock erupts onto the sea floor. Small holes from escaping gases leave them rough and course c.

Obsidian exhibits a texture. False t f the particles in breccia are primarily silt sized. The tholeiitic and the alkali basalts. Granite and gabbro.

It is thinner denser younger and of different. True t f basaltic rocks make up most of the sea floor. The pressures at depth causes them to have a rough texture d. The uplift process that exposes the rock fractures them and makes them rough b.

Have a similar texture. It is composed of several layers not including the overlying sediment. The topmost layer about 500 metres 1 650 feet thick includes lavas made of basalt that is rock material consisting largely of plagioclase and pyroxene oceanic crust differs from continental crust in several ways. The slow cooling at depth allows large crystals to grow.

Continental exceeds 70 kilometers under some mountainous regions while oceanic crust ranges from 3 to 15 kilometers. One magma can produce several different igneous rocks having different mineral compositions. The average rock density is about 2 7 g cm3 composition is comparable to the felsic igneous rock granodiorite. Oceanic crust is the uppermost layer of the oceanic portion of a tectonic plate it is composed of the upper oceanic crust with pillow lavas and a dike complex and the lower oceanic crust composed of troctolite gabbro and ultramafic cumulates.

Basaltic rocks make up most of the sea floor. Basalts may be broadly classified on a chemical and petrographic basis into two main groups. Oceanic crust is about 6 km 4 miles thick. Intrusive igneous rocks are often characterized as coarse grained because.

The density is about 3 0 g cm3 composed mainly of the igneous rock basalt. False t f slate is associated with high grade metamorphism.