Question

Sample P is granite, an igneous rock. Which of these is NOT a characteristic of igneous rock?
Responses
A Igneous rocks can have large crystals.Igneous rocks can have large crystals.
B Igneous rocks are generally the hardest and heaviest rocks.Igneous rocks are generally the hardest and heaviest rocks.
C Igneous rocks are conglomerates, predominantly composed of rounded gravel.Igneous rocks are conglomerates, predominantly composed of rounded gravel.
D Igneous rocks contain minerals, providing details on the conditions in which the magma originated, cooled, and solidified.

Answer 1

C

Conglomerates (rocks made of rounded gravel-sized clasts) are sedimentary, not igneous. Igneous rocks form from cooled magma and can have large crystals (intrusive), contain diagnostic minerals, and tend to be hard/dense, but are not conglomerates.