151.The Earth's internal heat
mainly comes from A.Liquid hydrogen B.Chemical reactions C.Radioactive decay D.Molecular kinetic energy 152.There are different
reasons on the Earth because of A.Rotation of the Earth B.Revolution of the Earth C.The Earth's axis is
tilted D.The Earth's distance from
the Sun 153.On average, Air contains
________ % of water vapour. A.1 B.3 C.5 D.7 154.Earth's troposphere
extends from the Earth's surface to an average height of about ________ km. A.10 B.12 C.15 D.17 155.The science of lightning
is called A.Aerology B.Meteorology C.Electeorology D.Fulminology 156.Ships use ________ to
find the depth of the ocean beneath them. A.Pictches B.Echoes C.Frequencies D.None of these 157.Molecules with identical
molecular formulae but with different structural formulae are called A.Isomers B.Isotopes C.Atomic number D.Mass number 158.The anode is the
electrode connected to the ________ terminal of a battery. A.Positive B.Negative C.Neutral D.Free 159.The unit used to measure
humidity is A.Barometer B.Hydrometer C.Hygrometer D.Galvanometer 160.Laser was invented by A.Volta B.Sturgeon C.Hero D.Maiman
151.The Earth's internal heat
mainly comes from
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