The Flow Patterns Found on the Surface of Mars and the Number

question 63

Multiple Choice

The flow patterns found on the surface of Mars and the number of craters on top of them suggest that

• A) Mars is today a liquid, water-rich world.
• B) the climate on Mars was different billions of years ago.
• C) volcanism is occurring on Mars.
• D) the polar caps are made of liquid water.
• E) all of the above.

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Definitions:

Methylcyclohexane

A saturated hydrocarbon with the formula C7H14, characterized by a methyl group attached to a cyclohexane ring, used as a solvent and in organic synthesis.

Cycloheptane

A cyclic alkane with the molecular formula C7H14, consisting of a ring of seven carbon atoms.

Phenol

An aromatic organic compound with the formula C6H5OH, used as an antiseptic and a raw material in the synthesis of plastics.

Molecular Formula

A notation used in chemistry to show the types and numbers of atoms combined in a single molecule of a chemical compound.