Question

which statement below best explains one reason why earth is able to sustain life?
the atmosphere acts like a greenhouse, trapping heat next to earth’s surface.
the oceans act like a filter, separating microwave energy from infrared energy.
the magnetic field acts like a force, keeping objects from floating off of the planet.
the continents act like a shield, preventing light energy from reaching earth’s core.

Explanation:

• Analyze each option:
• Option 1: The atmosphere's greenhouse effect traps heat, maintaining a temperature suitable for life. This is a key factor for life sustainability.
• Option 2: Oceans don't separate microwave and infrared energy in this way; this statement is incorrect.
• Option 3: Gravity (not the magnetic field) keeps objects from floating off Earth.
• Option 4: Continents don't act as a shield to prevent light from reaching the core, and light energy doesn't target the core for life - sustaining reasons.

Answer:

A. The atmosphere acts like a greenhouse, trapping heat next to Earth’s surface.