Which of the following is not a reason that scientists have inferred that the core consists mostly of iron?
A) Iron is the only common element that accounts for the high density of the core.
B) Liquid iron in the core can explain Earth's magnetic field.
C) Molten iron's typical movement accounts for the wobbly rotation of Earth on its axis.
D) Some meteorites consist mostly of iron and appear to be likely analogs for planet cores.
Answer: C
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Soil conservation on farms is best implemented by which of the following methods?
A. terracing, contour farming, and alley cropping B. contour farming, plowing, and cover crops C. alley cropping, cover crops, and plowing D. plowing, tilling, and contour farming E. cover crops, alley cropping, and tilling
Determine if the phrase in bold applies to only volcanic rocks, only plutonic rocks, bith types of rocks or niether type of rock. May form from basaltic magma
A. Both volcanic and plutonic igneous rocks B. Neither volcanic or plutonic igneous rocks C. Only plutonic igneous rocks D. Only volcanic igneous rocks
Volcanic island arc activity is short-lived and as a result will only produce tiny islands
Indicate whether this statement is true or false.
Volcanism creates mountains that are
A. varied in size from small cinder cones to large shield and composite volcanoes. B. sometimes local and not accompanied by regional increases in crustal thickness. C. formed of piled volcanic material, such as scoria, ash, lava flows, debris flows, and mudslides. D. All of these are types of mountains created by volcanism.