boulder boogie a mystery in death valley: what moved this rock across the desert floor? ...
TRANSCRIPT
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.