help now please Plate tectonics is a result of the earth\'s internal heat engine

Question

help now please

Plate tectonics is a result of the earth's internal heat engine, powered by (a) the sun (b) gravity (c) heat flowing from the earth's interior outward (d) wind and water. A typical rate of plate motion is (a) 3-4 meters per year. (b) 1 kilometer per year (c) 1-10 centimeters per year (d) 1000 kilometers per year Oceanic and continental crust differ in (a) composition (b) density (c) thickness (d) none of the above The lithosphere is (a) the same as the crust (b) the layer beneath the crust (c) the crust and upper mantle (d) part of mantle Which is not true a single silicon-oxygen tetrahedron? (a) the atoms of the tetrahedron are strongly bonded together (b) it has a net negative charge (c) The formula is SiO_4 (d) it has four silicon atoms Which is not a type of silicate structure? (a) isolated (b) single chain (c) double chain (d) sheet (e) framework (f) pentagonal

Explanation / Answer

c. Heat flowing from interior to outward. Explanation: Due to heat transfer mechanically the plates move over each other. 1-10 centimeters per year. Explanation: Some plates move about 1 centimeters or more than 4 centimeters. But typical motion is from 1 cm to 10 cm. b. density. Explanation: Oceanic crust has lower density. c. crust and upper mantle. Explanation: it is the rigid upper part of the earth consisting of crust and upper mantle. d. It has four silicon atoms. Explanation: its formula is SiO4. It has one silicon and four oxygen atoms. f. pentagonal.

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