What are the relative compositions of the materials from which stars form?
A) about 74% hydrogen, about 24% helium, no more than 2% other materials
B) about 24% hydrogen, about 74% helium, no more than 2% other materials
C) about 2% hydrogen, about 74% helium, no more than 24% other materials
D) Stars have vastly differing combinations of materials.
A
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The mass number of an element is
A. the sum of the isotopes. B. the sum of the electrons and the neutrons. C. the sum of the protons and the neutrons. D. the number of protons. E. the sum of the electrons and the protons.
Placer gold deposits were accumulated by stream processes. Indicate whether the statement is true or false
If there was once one supercontinent over 200 million years ago, then there was a single ocean called ____
A) ?Pangaea B) ?Panthalassa C) ?Oceanus D) ?Tethys
During the 1950s, people lived on average more than two decades longer in developed countries than in developing ones. In the twenty-first century, the gap is ________
A) less than 5 years B) less than 10 years C) less than 15 years D) still the same E) increased to 30 years