chapter 10-3

Question 1

what are intrusive features?

Answer 1

When magma forces its way through cracks in the upper crust but fails to reach the surface

Question 2

what are plutons and where do they form?

Answer 2

Structures the underground magma forms when it cools. forms in crust where magma cools the intrusive igneous rock

Question 3

what are sills and laccoliths?

Answer 3

Plutons that form when magma intrudes between rock layers close to the surface then harden

Question 4

how do sills form?

Answer 4

When magma squeezes between horizontal layers of sedimentary rock. Form in shallow depths, less pressure. Allows magma to lift underlying rock so magma can squeeze in

Question 5

how do laccoliths form?

Answer 5

Lens-shaped pluton has pushed the overlying rock layers upward. Magma has a higher viscosity compared to sills, collects in a mass that bulges upward

Question 6

how do dikes form?

Answer 6

Plutons that form when magma from magma chamber moves into fractures that cut upward through rock layers. Doesn’t reach surface

Question 7

how do batholiths form?

Answer 7

Mass of rock formed when a large body of magma cools inside Earth’s crust. Surface exposure, rather thick

Question 8

what are dome mountains?

Answer 8

Formed by smaller bodies of hardened magma, pushed up and layers above rock bend into a dome shape