Sedimentary Rocks

Question 1

How are Sedimentary Rocks formed?

Answer 1

They form in layers known as strata, and are made from sediments that have been cemented together.

Question 2

Examples of Sedimentary Rocks include… (name one?)

Answer 2

Gypsum, shale, limestone

Question 3

Types of Sedimentary Rocks (the names of these change depending on what teacher you have)

Answer 3

Clastic, Chemical, Biochemical/Organic

Question 4

How are Sedimentary Clastic Rocks made?

Answer 4

Made of pre-existing rocks (e.g. shale)

Question 5

How are Sedimentary Chemical Rocks made?

Answer 5

Precipitated from a solution, such as saltwater

Question 6

How are Sedimentary Biochemical/Organic rocks made?

Answer 6

Made from the remains of dead organisms, for example, limestone

Question 7

What is a fossil?

Answer 7

Fossils are preserved evidence of organisms that once existed.

Question 8

Fossil Types

Answer 8

Mould
Cast
Trace
True Form

Question 9

Can you name a way fossils form?

Answer 9

Unaltered Preservation
(most common) Premineralisation/Petrification
Replacement
Carbonisation/Coalification
Recrystalisation

Question 10

What is the Law of Superposition?

Answer 10

The law of superposition states that in any undisturbed sequence of rocks deposited in layers, the youngest layer is on top and the oldest layer is on the bottom. Each layer being younger than the one beneath it and older than the one above it.

(Basically, youngest layer on top, oldest on the bottom)