Deserts are commonly cool at night because desert soils have little vegetation or moisture to help store the heat.
Answer the following statement true (T) or false (F)
True
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Radium-226 is a common isotope on Earth, but has a half-life of about 1600 years. Given that Earth is some 5 billion years old, why is there any radium at all?
A. Radium-226 and Radium-218 undergo a series of transmutation reactions of alpha and beta decay to repeatedly become one another approximately every 1600 years. B. Radium-226 is a "daughter" isotope and the result of the radioactive decay of uranium. C. Radium-226 is one of several self-transmutating isotopes of the elements of the periodic table and is able to replenish itself so that it is never depleted. D. Radium-226 and Astatine-218 are converted back and forth via transmutation to one another at each of their respective half-life cycles.
Which of the following drainage patterns forms on highly fractured bedrock?
A. trellis B. radial C. dendritic D. rectangular
The latitude at which the noon sun is directly overhead is known as the sun's ____
a. declination. b. insolation. c. perihelion. d. analemma.
In the early 1900s the German meteorologist ________ made a strong case for continental drift.
A. Diane Carlson B. Alfred Wegener C. Charles Plummer D. Ben Franklin E. George Bush