Boulder Boogie A mystery in Death Valley: What moved this rock across the desert floor? ...

METAMORPHIC ROCK

BELLRINGER

Boulder Boogie A mystery in Death Valley:

What moved this rock across the desert floor?

Scientists call it the “dancing rocks”.

Visitors call the dry lake bed,the “Racetrack”.

BELLRINGER

Boulder Boogie A mystery in Death Valley:

What moved this rock across the desert floor?

Several times a year, powerfulstorms rip across the lake bed,bringing plenty of rain, wind & snow. The clay surface becomes slippery,

and that’s when the rocks dance.

METAMORPHIC ROCK

Objectives1. Describe two ways a rock can

undergo metamorphism.2. Explain how the mineral composition

or rock changes as the rocks undergo metamorphism.

3. Explain how metamorphic rock structures are related to deformation.

TWO WAYS A ROCK CAN UNDERGO METAMORPHISM

Contact Metamorphism- Heated by nearby magma.

Regional Metamorphism- When pressure builds up in rock that is buried deep below other rock formations or when large pieces of the Earth’s crust collide with each other.

TWO WAYS A ROCK CAN UNDERGO METAMORPHISM

TWO WAYS A ROCK CAN UNDERGO METAMORPHISM

• Rocks were once sedimentary, igneous, or another metamorphic rock. • These rocks are physically deformed & chemically changed due to different temperatures and pressures.

HOW THE MINERAL COMPOSITION OR ROCK CHANGES AS THE ROCKS UNDERGO METAMORPHISM

•The original minerals in a rock change into new minerals that are more stable in new pressure & temperature conditions.

HOW METAMORPHIC ROCK STRUCTURES ARE RELATED TO DEFORMATION

Metamorphic rock structures are caused by deformation.

Deformation is a change in the shape of a rock caused by a force placed on it.

Ex. Sedimentary shale becomesfoliated metamorphic rock slate.

METAMORPHIC ROCK STRUCTURES

Foliated- The texture of metamorphic rock in which the mineral grains are arranged in planes or bands. Ex. Gneiss

Non-foliated- the texture of metamorphic rock in which the mineral grains are not arranged in planes or bands. Ex. Marble

METAMORPHIC ROCK

Objectives1. Describe two ways a rock can

undergo metamorphism.2. Explain how the mineral

composition or rock changes as the rocks undergo metamorphism.

3. Explain how metamorphic rock structures are related to deformation.