Difference between intramembranous and endochondral ossification

The major difference in the two process of ossification lies in the type of bones formed, base material of bone formation and speed

Explanation:

The major difference between intramembranous ossification and Endochondral Ossification are as follows –  

a)Intramembranous ossification forms bones that are soft, spongy and compact while endochondral ossification does not actually form bone. It produces and refines cartilages

b)In the Intramembranous ossification bones are formed by refining sheets of undifferentiated connective tissue i.e mesenchymal while endochondral ossification refines the hyaline cartilage

c)The process of intramembranous ossification is slower than that of endochondral ossification.

the answer is a) a shiprock was formed by igneous process