Earth Science I3

Which of the rocks below is a sedimentary rock?

• Limestone
• Basalt
• Granite
• None of the above

If you were to dig about 1,000 meters below Earth's surface, you would most likely find ___.

• rock
• soil
• mantle
• lava

The Colorado River started eroding the Grand Canyon 6 million years ago.  Of the layers shown at Location Z, which two layers did the Colorado River erode away first?

• Toroweap Formation and Coconino Sandstone
• Super Group and Redwall Limestone
• Bight Angel Shale and Tapeats Sandstone
• All layers are eroded at the same time by the Colorado River.

If you could return to the Grand Canyon 2 million years in the future and visit Location Z, what layer of rock might you observe at river level?

• Toroweap Formation
• Supai Group
• Redwall Limestone
• Muav Limestone

How could an igneous rock turn into a metamorphic rock?

• Melting and cooling
• Heat and pressure
• Weathering, erosion, and deposition
• An igneous rock cannot turn into a metamorphic rock

How could a metamorphic rock turn into a sedimentary rock?

• Melting and cooling
• Heat and pressure
• Weathering, erosion, and deposition
• A metamorphic rock cannot turn into a sedimentary rock.

A geologist finds a rock layer that is tilted.  The fossils in the rock include brachiopods and coral.  It fizzes when acid is dropped on it.  Evidence supports that this rock formed in a basin, contains calcite, and ___.

• contains salt deposits
• formed in ocean water
• was originally part of a sand dune
• is likely to have fossilized insect tracks

Which sediment would be more likely found near location Z?

• cobble
• silt
• boulder

Which sediment would be more likely found near location X?

• boulder
• silt
• clay

What is soil made of?

• Humus
• Weathered rock
• Sand, silt, and clay
• All of the above