37) 37) With the exception of volcanoes associated with a subduction zone, most

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37) 37) With the exception of volcanoes associated with a subduction zone, most volcanic islands are volcanoes A) Composite Cone C) Caldera B) Shield D) Cinder Cone 38) 38) What kind of volcano is most closely associated with pyroclastic flows? A) Shield C) Composite Cone B) Cinder Cone D) Caldera 39) Which two minerals define a felsic composition? 39) A) Plagioclase Feldspar and Biotite Mica C) Quartz and Potassium Feldspar B) Pyroxene and Amphibole D) Muscovite and Biotite Micas 40) What is the accepted age of the Earth? 40) A) 4.6 billion years C) 6,000 years B) 1 million years D) 4.6 million years 41) A location where continental rifting is occurring today is 41) A) San Andreas Fault C) East African Rift Valley B) Juan de Fuca Trench D) Mid-Continent Rift 42) According to the plate tectonics model, most global mountain ranges are associated with which 42) kind of plate boundary? A) Transform B) Convergent C) Divergent 3) What is the mineral name for table salt? A) Calcite B) Halite C) Dolomite D) Gypsum 44) What environmental condition had to change before subatomic particles could come together and44) form the first atoms after the Big Bang? A) Pressure had to increase to force the subatomic particles together B) Temperature had to decrease so the subatomic particles could join into an atom C Solar radiation had to increase to fuse the subatomic particles together D) More interstellar material had to collect to have enough material to create atoms E) All of the above 5) What is the definition of differentiation? 45) A) Categorization based on chemical formulas B) Separation of materials based on density C) Mixing of materials to produce a new compound D) Divisions of planets based on constituent materials 46) Define magma. 40 A) Molten rock that has been erupted B) A material's resistance to flowing C) Dissolved gases in molten rock D) Molten rock that contains dissolved gases and some crystals

Explanation / Answer

37)shield

38)composite volcano

a composite volcano is a conical volcano built up by many layers (strata) of hardened lava, tephra, pumice, and volcanic ash. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile and periodic explosive eruptions and effusive eruptions, although some have collapsed craters called calderas. The lava flowing from stratovolcanoes typically cools and hardens before spreading far due to high viscosity. The magma forming this lava is often felsic, having high-to-intermediate levels of silica (as in rhyolite, dacite, or andesite), with lesser amounts of less-viscous mafic magma

39)Quartz and Potassium Feldspar

In geology, felsic refers to igneous rocks that are relatively rich in elements that form feldspar and quartz. It is contrasted with mafic rocks, which are relatively richer in magnesium and iron. Felsic refers to those rocks rich in silicate minerals, magma, and rocks which are enriched in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium.

40)4.6 billion years

41)East African rift valley

42)convergent

A tectonic boundary where two plates are moving toward each other. If the two plates are of equal density, they usually push up against each other, forming a mountain chain. If they are of unequal density, one plate usually sinks beneath the other in a subduction zone.

43)halite

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