Question

select all the correct answers. some scientists hypothesize that icy debris arrived on other terrestrial planets in a similar manner to how it arrived on earth. on earth, the ice eventually turned to water and water vapor, forming extensive oceans and a life - sustaining atmosphere. but the same is not exactly true for the other terrestrial planets. what are two reasons why? temperatures on earth are ideal for water to exist in solid, liquid, and gaseous forms. magnetic forces generated in earths mantle are directly responsible for earths oceans. earths gravity holds the water vapor in earths atmosphere close to its surface. earths solid outer core is sufficiently rigid to keep water above its surface.

Explanation:

1. Earth's temperature allows water to cycle through solid (ice), liquid (water), and gas (water - vapor) states, which is crucial for ocean and atmosphere formation. Other terrestrial planets may not have such ideal temperatures.
2. Earth's gravity is strong enough to hold water vapor close to its surface, contributing to the formation of a life - sustaining atmosphere. Other planets may lack this gravitational pull. Magnetic forces in Earth's mantle are not directly responsible for oceans, and the solid outer core's rigidity has little to do with water being above the surface in the context of this question.

Answer:

• Temperatures on Earth are ideal for water to exist in solid, liquid, and gaseous forms.
• Earth's gravity holds the water vapor in Earth's atmosphere close to its surface.