The Reason That Worlds Like the Earth Are Differentiated Is

question 39

Multiple Choice

The reason that worlds like the Earth are differentiated is that

• A) the heat of the Sun vaporized much of their solid material early on
• B) the heaviest chunks that hit early on were able to bore through solid rock to the center
• C) the continuing impacts on a growing protoplanet eventually melted the entire body
• D) large amounts of hydrogen and helium collect around such planets a little later in their history
• E) planetesimals with different types of composition hit at different times, with the heaviest ones hitting first

---

Definitions:

Müller-Lyer Illusion

A visual illusion in which two lines of the same length appear to be of different lengths because of the orientation of arrow-like tails at their ends.

Depth Cue

Visual information that allows a person to judge the distance or depth of objects in relation to themselves.

Retina

The light-sensitive layer of tissue at the back of the inner eye, which converts light images into electrical signals sent to the brain through the optic nerve.

Brightness Constancy

The human visual system's ability to perceive the relative brightness of objects regardless of the amount of light illuminating them.