Sedimentary Rocks

Sedimentary rock forms from:

• weathering and erosion, and then compaction and cementation

• crystallization of magma

• intense pressure and heat

• asteroid impacts

Answer explanation

Tags

NGSS.MS-ESS2-1

What percentage of rocks at Earth's surface are sedimentary?

• 10%

• 25%

• 75%

• 90%

Answer explanation

Tags

NGSS.MS-ESS1-4

Which of the following best describes the difference between conglomerate and breccia?

• there is no difference between breccia and gonglomerate

• breccia particles are rounded while conglomerate particles are angular

• breccia particles are angular while conglomerate particles are rounded

• breccia is composed of sand while conglomerate is composed of mud

Answer explanation

These can be sediments of detrital sedimentary rocks:

• Clay

• Evaporites

• Shells and other animal hard parts

• Gravel

• Sand

Answer explanation

Tags

NGSS.MS-ESS2-1

These can be sediments of chemical sedimentary rocks:

• Clay

• Shells and other animal hard parts

• Gravel

• Plant material

Answer explanation

Conglomerate

• Detrital

• chemical

Limestone

• Detrital

• chemical

Coquina

• Detrital

• chemical

Sandstone

• Detrital

• chemical

Chalk

• Detrital

• chemical