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) With the exception of volcanoes associated with the subduction zone, most volcanic islands are composite cone volcanoes. Because stratocone erupts an andesitic to dacitic volcano which is associated with subduction zones magma compositions.

38) Composite cone volcano is most closely associated with pyroclastic flows. Because Stratocones volcanoes made up of silica rich lava flows. It explosively erupts pyroclastic rocks and igneous intrusives which are accumulated around the vent.

39) Quartz and potassium feldsper is the two felsic minerals. Because Felsic minerals are light coloured silicate minerals. Felsic minerals contain lower percentage of the heavier elements and higher percentage of the the lighter elements, such as silicon and oxygen, aluminum, silica and potassium etc.

40) The age of the earth is 4.6 billion years. It is measured by K-Ar radioactive dating method on stone meteorites.

41) A location where continental rifting is occuring today is East African Rift Valley.

42) Accroding to plate tectonics model, most global mountain ranges are associated with convergent plate boundary. Because accumulated sediments rises high to form mountains due to presence of high shearing pressure during subduction. Notonly that butalso hot melted magma comes out to form volcanic islands.

43) Halite is known as table salt. Halite is a chemical compound of sodium chloride. Its natural form is known as rock salt or halite

44) The condition had to change before subatomic particles could come together and form the first atoms after the Big Bang is temperature had to decrease so the subatomic particles could join into an atom.

45) Differentiation is the mixing of materials to produce a new compound.

46) Magma is molten rock that contains dissolved gases and some crystals. When it comes out to the surface it may form rocks (composed of different minerals). The flow of magma in the surface is known as lava.

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