Metamorphic Rock Formation Concepts

The video tutorial discusses the formation of metamorphic rocks, focusing on the transformation of limestone to marble and shale to slate, schist, and gneiss. It explains the role of pressure and temperature in these processes, particularly at ocean-to-continent convergent plate boundaries. The video also distinguishes between foliated and non-foliated rocks, highlighting how different conditions lead to the formation of various rock types. Additionally, it covers why limestone and sandstone do not form different rocks under pressure due to their mineral composition.

What is the primary difference between foliated and non-foliated rocks?

• Non-foliated rocks are always harder than foliated rocks.

• Foliated rocks have a banded appearance, while non-foliated rocks do not.

• Non-foliated rocks are formed under low pressure.

• Foliated rocks are formed only from igneous rocks.

What happens to oceanic crust at an ocean to continent convergent plate boundary?

• It remains stationary.

• It rises above the continental crust.

• It forms a new oceanic ridge.

• It dives beneath the continental crust.

Which rock is formed when limestone undergoes metamorphism?

• Slate

• Quartzite

• Marble

• Schist

What type of rock does shale transform into under high pressure and temperature?

• Gneiss

• Quartzite

• Marble

• Schist

Why does shale near a magma body form non-foliated rocks?

• Due to high pressure and low temperature.

• Due to high temperature and low pressure.

• Due to low temperature and low pressure.

• Due to high pressure and high temperature.

What is the main factor that causes the formation of foliated rocks?

• Proximity to water

• Directed pressure

• High pressure only

• High temperature only

What mineral is limestone primarily composed of?

• Mica

• Calcite

• Quartz

• Feldspar

Why do limestone and sandstone not form different rocks under pressure?

• Their minerals do not orient under pressure.

• They are already metamorphic.

• They are too soft.

• They are not affected by temperature.

What is the characteristic shape of grains in limestone and sandstone under pressure?

• Flat

• Equant

• Elongated

• Irregular

Which of the following rocks is not formed from shale?

• Quartzite

• Slate

• Schist

• Gneiss