Unconformities

Which option is the correct definition for "unconformities"?

• The remains or traces of ancient living things

• Surfaces where rock has eroded away producing a gap in the rock record

• The matching of rock layers or fossils exposed in on region compared to another region

• Fossils that represent organisms that existed on Earth abundantly but for a short time

What type of unconformity is shown in the picture?

• angular unconformity

• disconformity

• nonconformity

• none of the above

Tags

NGSS.MS-ESS1-4

What can cause rocks to erode?

• human activity

• fossilisation

• animal activity

• wind and water

Tags

NGSS.MS-ESS2-2

NGSS.MS-ESS2-4

What are the arrows in the picture pointing to?

• Fossils

• Gap in the rock record

• New rock layer

• Older rock layer

Tags

NGSS.MS-ESS1-4

NGSS.MS-ESS2-3

Which option best describes this type of unconformity?

• Horizontal layers of sedimentary rock deposited above titled sedimentary rock.

• Layer of sedimentary rock overlies a layer of igneous or metamorphic rock.

• Horizontal layer of sedimentary rock overlies another layer of horizontal sedimentary rock.

• All of the above

Tags

NGSS.MS-ESS1-4

Erosion takes __________ of years to occur.

• hundreds

• thousands

• millions

Tags

NGSS.MS-ESS2-2

NGSS.MS-ESS2-4

• Disconformity

• Nonconformity

• Angular unconformity

• Paraconformity

Answer explanation

Note there was no layered appearance to the layers below, probably indicating that it was composed of igneous rock

Tags

NGSS.MS-ESS1-4

Which process created the unconformity - black squiggly line

• deposition of sediments

• uplift and erosion

• faulting of the earths crust

Tags

NGSS.MS-ESS1-4