an extrusive igneous rock could form in which of the following scenarios?\no a an effusive volcanic eruption…
an extrusive igneous rock could form in which of the following scenarios?\no a an effusive volcanic eruption leaves a thin layer of lava on the slope of a volcano.\no b continental crust 3000 meters under a large mountain range is altered by temperature and pressure.\no c sediment carried by a river is buried in a delta and undergoes lithification.\no d a large magma chamber cools slowly 200 meters below earths surface.
Answer
Brief Explanations:
- Extrusive igneous rocks form from lava that cools quickly on the Earth's surface.
- Option a describes an effusive volcanic eruption (lava flow) on the volcano slope (surface), which is where extrusive igneous rocks form.
- Option b: Alteration of continental crust by temperature and pressure forms metamorphic rocks.
- Option c: Lithification of sediment forms sedimentary rocks.
- Option d: Slow - cooling magma (200 meters below surface, still intrusive environment) forms intrusive igneous rocks.
Answer:
a. An effusive volcanic eruption leaves a thin layer of lava on the slope of a volcano.