Fossil fuels are best described as a(n) ________ energy source
A) environmentally friendly
B) clean
C) renewable
D) efficient
E) nonrenewable
E
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Daily changes in the elevation of the ocean surface are called ________.
A) tides B) tombolos C) sea arches D) tidal flats
What was Niels Bohr's explanation for the observation of atomic spectra?
A. Electrons could only move in discrete energy steps within an atom. B. Only certain photons with the correct energy could excite the quanta in the nucleus. C. Nucleons could be excited by different electron energies. D. Any photon could excite an electron. E. Electrons could not move in an atom.
The energy that drives the hydrologic cycle comes from the _______________
Fill in the blank(s) with correct word
What did Harry Hess and Robert Dietz suggest the cause of the continents moving was?
a. Convection currents b. Radioactive decay c. Conduction d. Gravity