Hydrogen "burning" in stars is ________
A) an atomic reaction that generates hydrogen by splitting helium atoms
B) hydrogen atoms that combine with deuterium atoms to make HD complexes, and this reaction generates immense amounts of energy.
C) an atomic reaction that fuses 4 protons to make a helium nucleus, releasing energy by converting mass to energy
D) a chemical reaction that bonds hydrogen to oxygen to make water, which remains a gas because of the extremely high temperatures
C
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A stream is more likely to be represented as a single line on a 1:100,000 scale map than a 1:24,000 scale map.
Answer the following statement true (T) or false (F)
How were the Appalachian Mountains formed?
A) thrust and uplift of continental crust B) accretion by subduction zones C) as a volcanic island arc D) sea mounts and island volcanoes
What countries comprise the Maghreb of Southwest Asia/North Africa?
A) Algeria, Libya, Egypt B) Libya, Egypt, Tunisia C) Morocco, Algeria, Tunisia D) Tunisia, Libya, Egypt E) Western Sahara, Algeria, Libya
What are the SDGs? How do they compare to the MDGs?
What will be an ideal response?