57) The composition of the inner core of Earth is thought to be A) basalt B) gab

Question

57) The composition of the inner core of Earth is thought to be A) basalt B) gabbro C) peridotite D) solid iron-nickel alloy is the thickest layer of the Earth. 58) The A) crust B) outer core C) mantle Dl inner core 59) Lava flows are typically finer grained than intrusive igneous rocks. Why? A) Intrusive magma is cooler because it is well insulated by the surrounding rock. B) Intrusive magma flows onto the Earth's surface and cools very slowly, allowing many small mineral grains to grow. C) The extrusive magma cools quickly so the mineral grains do not have time to grow. D) The extrusive magma, because it is deep below the surface, cools very slowly producing small mineral grains 60) New oceanic crust and lithosphere are formed at A) Divergent boundaries by submarine eruptions and intrusions of rhyolitic magma B) Convergent boundaries by submarine eruptions and intrusions of rhyolitic magma C) Divergent boundaries by submarine eruptions and intrusions of basaltic magma D) Convergent boundaries by submarine eruptions and intrusions of basaltic magma 61) What mineral listed below has the highest Mohs hardness? A) graphite B) native gold C) talc D) apatite 62) Which of the following minerals or group of minerals do not have well-developed cleavage direction(s)? A) clay minerals B) olivine C) biotite D) pyroxene minerals 63) Which of the statements below is most correct with reference to the figure at right? A) The mineral could be galena B) The mineral could be calcite C) The mineral could be quartz D) The mineral could be olivine

Explanation / Answer

57] Option D is correct

  It is surrounded by a liquid, outer core composed of a nickel-iron alloy. The outer core is about 1,355 miles (2,180 km) thick. The inner core spins at a different speed than the rest of the planet. This is thought to cause Earth's magnetic field.

58] Option C is correct

The Earth can be divided into four main layers: the solid crust on the outside, the mantle, the outer core and the inner core. Out of them, the mantle is the thickest layer, while the crust is the thinnest layer.

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