Chapter 8 - Sedimentary Rocks

Question 1

Clastic Sedimentary

Answer 1

-Has layers
- pieces of broken rock
- can be fine and grainy or like mudstone
- When sediments are deposited compacted and cemented
- may contain fosils

Question 2

Chemical Sedimentary

Answer 2

A type of rock that forms when dissolved minerals crystalize within sediments, usually as water evaporates and leaves minerals behind

Question 3

Biogenic Sedimentary

Answer 3

A type of rock that forms when dead plant or animal remains accumulate and are cemented together
e.g. chalk, coal
-many layers, no clear sediments, soft and brittle

Question 4

Strata

Answer 4

layers of sedimentary rock

Question 5

index fossils

Answer 5

Fossils used to compare starta from different regions

Question 6

why do only some organisms become fossils

Answer 6

They have to be buried while they are dying or straight after dying.

Question 7

How are fossils made?

Answer 7

-Buried in low oxygenated areas and decay underground slowly

Question 8

Compact and cement

Answer 8

compacted - the rocks squeeze out water
cementing - minerals in water left behid crystalize cementing them together. SIlia and limestone help stick it together occurig from groundwater