Exam 6: Pages of Earths Past: Sedimentary Rocks

Finding mudstone,chalk,and chert together at outcrops suggests that the ancient environment represented was ____________.

The breakdown of exposed rock into small fragments and dissolved ions is termed ____________.

Lithified detritus (breakdown products of preexisting rocks)forms which kind of sedimentary rock?

Most sorting of detrital grains takes place during ____________.

The majority of the rocks that occur at the surface of Earth are ____________.

Physically precipitated (chemical)limestone that forms in caves is termed ____________.

Compaction and cementation of grains occurs during ____________.

Because the velocity of sediment settling (deposition)is positively related to grain size for waterborne sediments,fluvial deposits are more likely than glacial deposits to ____________.

When limestone becomes chemically altered so that half of the calcium atoms are replaced by magnesium,the resultant rock is termed ____________.

Which transport medium carries the largest particles?

Which environment would most likely produce sedimentary deposits characterized by poorly to moderately sorted,angular to subangular grains that consist of feldspar,quartz,and lithics (rock fragments)?

A fine-grained clastic rock that splits into thin sheets is ____________.

As compared to arkose,quartz sandstone ____________.

Chemical and biochemical rocks are classified primarily on the basis of ____________.

Diagenesis refers to ____________.

Sedimentary deposition is a continuous process; rivers,lakes,and the ocean deposit sediments nonstop at a fairly constant rate.

Bedding refers to ____________.

Cemented shells of marine organisms form which kind of sedimentary rock?

Of the grains above,which is more rounded?