What is a galaxy?
A. An area of a planet with a large concentration of meteor craters
B. A large grouping or cluster of stars
C. A long chain of active volcanoes
D. A very long distance measured by the speed of light
Answer: B
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How much of Earth's freshwater is easily accessed?
a) 2.5 percent b) 1.0 percent c) 1.5 percent d) 3.0 percent
The most common class of dunes is
A) parabolic B) star C) dome D) linear E) crescentic
Which of the following statements explains why the presence of Mesosaurus in both South America and Africa supports the continental drift hypothesis?
a. Mesosaurus was a freshwater aquatic reptile and swam from South America to Africa. b. Mesosaurus was a terrestrial reptile that rafted across the ocean from South America to Africa. c. Mesosaurus was a saltwater aquatic reptile and swam from South America to Africa. d. Mesosaurus was a freshwater aquatic reptile with fossil remains in both South America and Africa. e. Mesosaurus was a terrestrial reptile that was able to cross from Africa to South America by an isthmian link.
What does the following element description actually mean? hydrogen-2
A) a hydrogen with one neutron and one proton B) a hydrogen with two neutrons C) a hydrogen with two protons D) a molecule of hydrogen gas E) two hydrogen atoms