The basins of the Great Lakes were carved by running water during interglacial periods. Indicate whether the statement is true or false
F
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A scientific law may begin as a hypothesis that
A. a large group of competent observers agree as true. B. is tested repeatedly and not contradicted. C. both of these D. none of the above
It is theorized that a pulsar only emits X-rays and visible light during its early history. What do you suppose is the basis of this theory?
A. As the pulsar's energy dissipates, the frequency of the energy it emits drops. B. X-rays are likely the result of radioactive decay, which only can occur in a pulsar's early history. C. The pulsar's high rate of spin produces a magnetic field that, over time, slows the pulsar down. D. X-rays and visible light are both part of the electromagnetic spectrum.
Earth emits radiation with greatest intensity at ____ wavelengths
A) infrared B) radio C) visible D) ultraviolet
Select from the list below the coarse-grained igneous rock that is composed mainly of quartz and potassium feldspar.
A. Granite B. Basalt C. Diorite D. Andesite