Choose the correct answer

1			In the silicates, the basic silicon-oxygen structural element is in the shape of a
			A)	cube.
			B)	rhombohedron.
			C)	octahedron.
			D)	tetrahedron.
2			The most abundant single constituent of rocks is
			A)	quartz.
			B)	calcite.
			C)	white mica.
			D)	feldspar.
3			A group of fibrous silicate minerals once widely used because of their mechanical strength and resistence to fire but now known to cause lung and intestinal cancers is
			A)	feldspar.
			B)	asbestos.
			C)	cinnabar.
			D)	satin spar.
4			A mineral used as an insulator in electrical equipment is
			A)	kaolin.
			B)	white mica.
			C)	calcite.
			D)	quartz.
5			Limestone and marble are composed chiefly of the mineral
			A)	calcite.
			B)	mica.
			C)	quartz.
			D)	olivine.
6			A shiny, black igneous rock having the texture of glass is
			A)	slate.
			B)	conglomerate.
			C)	obsidian.
			D)	schist.
7			A coarse-grained metamorphic rock that resembles granite except for its banded appearance is
			A)	chert.
			B)	quartzite.
			C)	slate.
			D)	gneiss.
8			A sedimentary rock formed either as a chemical precipitate or by the consolidation of shell fragments is
			A)	limestone.
			B)	gneiss.
			C)	granite.
			D)	sandstone.
9			A seismograph detects
			A)	temperature gradients within the earth.
			B)	earthquake waves.
			C)	fluctuations in the earth's magnetic field.
			D)	radioactivity.
10			S waves differ from P waves in that S waves
			A)	can travel through liquids and P waves cannot.
			B)	are body waves and P waves are surface waves.
			C)	travel faster than P waves.
			D)	are transverse waves and P waves are longitudinal waves.
11			The earth's core
			A)	consists of a solid outer core and a liquid inner core.
			B)	is composed mainly of silicon.
			C)	is the source of the earth's magnetic field.
			D)	is completely solid.
12			Till is
			A)	a type of volcanic rock.
			B)	all of the material deposited directly by a glacier.
			C)	material deposited by a river within its floodplain.
			D)	a mineral deposit associated with hot springs and geysers.
13			A body of porous rock through which groundwater moves is called an
			A)	aquitard.
			B)	aquifer.
			C)	aquiclude.
			D)	aqueduct.
14			The process by which sediments become rock is called
			A)	diastrophism.
			B)	compaction.
			C)	tectonism.
			D)	lithification.
15			Which one of the following statements about batholiths is false?
			A)	The principle rock in batholiths is granite.
			B)	Batholiths are always associated with mountain ranges, either past or present.
			C)	Batholiths are very large plutons.
			D)	Batholiths form when magma cools rapidly at or very near the earth's surface.