Question 1
Rocks that contain high amounts of silica typically also contain ________.
◦ aluminum, sodium, and potassium
◦ aluminum, magnesium, and potassium
◦ calcium, magnesium, and potassium
◦ iron, magnesium, and potassium
Question 2
Intrusive igneous rocks are often coarse-grained because ________.
◦ the slow cooling at depth allows large crystals to grow
◦ the pressures at depth cause them to have a rough texture
◦ the uplift process that exposes the rock fractures them and makes them rough
◦ small holes from escaping gases leave them rough and coarse