Question

earths formation quick check
what is a planetesimal? (1 point)
○ two or more forms of the same element
○ a cloud of dust and gases that formed our solar system
○ large rocks that become the building blocks of planets
○ a planet in a different solar system

Explanation:

To determine the correct answer, we analyze each option:

• "Two or more forms of the same element" refers to isotopes, not planetesimals.
• "A cloud of dust and gases that formed our solar system" describes a nebula (like the solar nebula), not a planetesimal.
• "Large rocks that become the building blocks of planets" matches the definition of planetesimals, as they are small celestial bodies that accrete to form planets.
• "A planet in a different solar system" is irrelevant to the definition of a planetesimal.

Answer:

C. large rocks that become the building blocks of planets