Question 24
Igneous rocks are rocks that have formed from molten material. Which of the following is an igneous rock based on their description? Marble is a rock that formed when pre-existing limestone rock heated to such extreme temperature. Slate is a rock that is composed of clay or volcanic ash. Pyroclastic rocks are made of rock fragments that have been cemented together. A siltstone is a rock that is composed of silt. It is a form of mud rock with a low clay mineral content.