Why Is the Mass of Earth Important for Life

question 109

Multiple Choice

Why is the mass of Earth important for life?

• A) If Earth had more or less mass, it would not have plate tectonics and would be covered entirely by water.
• B) If Earth's mass were greater, we would be bombarded by meteorites and if it were smaller, we would not be able to hold the moon in orbit.
• C) If Earth had more or less mass, the atmosphere would be very different with either too much ammonia and methane or too little oxygen and water.
• D) If Earth's mass were significantly different, we would be bombarded by cosmic rays that would strip away our atmosphere.

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A technique in music wherein two or more voices independently harmonize with each other.