The Smooth, Dark Maria on the Moon Are

question 2

Multiple Choice

The smooth, dark maria on the Moon are

• A) immense basins that are smooth because they were covered by lava flows after the early heavy bombardment had ended.
• B) immense impact basins that are smooth because earlier craters were wiped out by the impact.
• C) areas that were still molten at the time of the early heavy bombardment and therefore show no evidence of the impacts.
• D) regions that, although as old as the cratered highlands, escaped the early heavy bombardment.

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Definitions:

Polyamides

Synthetic polymers made by the linkage of amino acids or by the polymerization of monomers with amide bonds, used in textiles and plastics.

Polymer

Large molecules made up of repeating structural units known as monomers.

Phosgene

A highly toxic and reactive compound with the formula COCl2, used as a chemical intermediate in the production of pharmaceuticals and pesticides.

Polycarbonates

A group of thermoplastic polymers containing carbonate groups in their chemical structures, known for their durability and used in the manufacture of eyewear, DVDs, and bulletproof glass.