It is believed that a giant impact may have taken away some of Mercury's low-density crustal rock and left a small, dense world with a(n) large, dense, and _______________ core.
Fill in the blank(s) with correct word
Question 2
____ supernovae are caused by the collapse of an iron core in a high mass star.
a. Only type Ia
b. Only type Ib
c. Only type II
d. type Ia and type II
e. type Ib and type II