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Origin of Sedimentary Rocks and Rock Structures

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Origin of Sedimentary Rocks and Rock Structures

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Questions and Answers

What do sedimentary rocks preserve?

History only

Clues about the environment only

A record of history (correct)

Organic materials only

What does stratification refer to in sedimentary rock?

The movement of sediment grains

The process of erosion

The process of making strata (correct)

The breaking down of sedimentary layers

What structures provide clues about the environment where sedimentary rocks formed?

Graded bedding and cross-bedding (correct)

Fossils and minerals

Strata and mud cracks

Ripple marks and ice deposits

How do sedimentary rocks form?

Through compression and cementation of sediment Signup and view all the answers

What is the term used to describe the layering found in sedimentary rock?

Stratification Signup and view all the answers

What natural forces move sediment grains around before they settle?

Water, ice, and wind Signup and view all the answers

What do sedimentary rocks contain besides bits of pre-existing rocks or minerals?

"Stratification" layers and bits of organic material Signup and view all the answers

What do changes in color in sedimentary rocks indicate?

Different minerals and origins of the sediments Signup and view all the answers

What can be inferred from the presence of rounded grains in sedimentary rocks?

The sediment arrived via water Signup and view all the answers

What is the significance of graded bedding in sedimentary rocks?

Indicates a current of water loaded with sediment Signup and view all the answers

What does cross-bedding reveal about the environment in which sedimentary rocks originated?

It originated in a beach, river, or sand dunes Signup and view all the answers

What can be inferred from the presence of ripple marks in sedimentary rocks?

The rock originated in a stream bed, lake, or beach Signup and view all the answers

What is the significance of mud cracks in sedimentary rocks?

They indicate periods of wetting and drying in specific environments Signup and view all the answers

How can studying layers of sedimentary rocks help infer clues about their origin?

By examining the shape of different sediment grains Signup and view all the answers

What does graded bedding in sedimentary rocks indicate about the age of rocks within a sequence?

The larger and older grains are typically found at the base of the bed Signup and view all the answers