Simplify the following text for a Grade 9 native English-speaking person.
Original: It is a primitive C-type asteroid , which means the surface has a high proportion of carbon ; giving it a dark surface that reflects only 4 % of the light that falls on it .
Simplified: It is a primitive C-type asteroid , which means the surface has lots of carbon ; giving it a dark surface that reflects only 4 % of the light that falls on it .