To improve the resolution of radio telescopes, astronomers ________
A) scan the skies rapidly to detect the direction of the radio signal
B) group smaller telescopes in arrays, like the very large array in New Mexico
C) make bigger telescopes
D) place the telescope in outer space
B
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Plastic wrap is made of nonpolar molecules and is able to stick well to polar surfaces, such as glass, by way of dipole-induced dipole molecular attractions. How is it that plastic wrap also sticks to itself so well?
A. Ions are formed as the plastic rubs against itself. B. by way of dipole-induced dipole molecular attractions C. by way of dipole-dipole molecular attractions D. by way of induced dipole-induced dipole molecular attractions
Silicate minerals make up approximately _____ percent of the Earth’s crust. Fill in the blank(s) with the appropriate word(s)
The greenhouse effect is bad and leading to global warming
Indicate whether the statement is true or false
Which of the following forms different layers from season to season and can be used to determine how many years the layers represent?
A. varves B. tree rings C. layers in ice cores D. All of these choices are correct.