CKLA G4U5L9 (9.1)

Lava flowed down the volcano's side and quickly hardened to form a glassy type of ____________ rock.

• metamorphic
• igneous

Tiny flakes of ____________ fell on the ground as an ancient tool maker worked to create a sharp blade for cutting.

• obsidian
• metamorphic

The tiny flakes of rock were washed into a nearby stream, where they joined other sediments created by the _____________ of rock from the nearby mountains.

• erosion
• compacted

The sediments formed layers on the stream bed, which ___________ over time as the weight of the layers squeezed out the air and water.

• erosion
• compacted

The sediments cemented together and ___________ into rock.

• texture
• solidified

______________ rock was buried by even more layers of sediments over millions of year.

• Sedimentary
• Metamorphic

The heat and pressure from the weight of the overlying rock changed the ____________ of the minerals in the rock.

• texture
• erosion

New __________ rock formed and lay buried in the earth for millions of years.

• sedimentary
• metamorphic

Heat from _________ below the rock melted it, turning it into igneous rock.

• obsidian
• magma

As part of its journey through the _____________, this piece of rock might someday be found on a each in Maine or a mountaintop in Tennessee.

• compacted
• rock cycle