Earth Science Sedimentary Rocks Classification

Question 1

-Rock that formed from mineral grains that fall out of solution by evaporation.

Answer 1

Crystalline

Question 1

-Rock that formed from the fragments or pieces of other rocks and can be identified by size.

Answer 1

Clastic

Question 2

-Rock that formed from the remains of plants and animals

Answer 2

Bioclastic

Question 3

-Occurs as water between sediments dissolve and the remaining material hold the clasts together

Answer 3

Cementation

Question 4

-A reduction in volume of sedimentary layers due to increasing weight of overlying sediments

Answer 4

Compaction

Question 5

-A rock formed when dissolved minerals in water form a crystalline mass of ingrown mineral crystals after evaporating.

Answer 5

Chemical Action

Question 6

What are the grain sizes

Answer 6

Clay
-0.002mm & smaller

Silt
-0.002mm-0.0625mm

Sand
-0.0625mm-2mm

Pebble
-2mm-64mm

Cobble
-64mm-256mm

Boulder
-256mm & up

Question 7

Characteristics:

Answer 7

1. Form at or near Earth’s surface where weathering can break down rocks into pieces
2. Forms in horizontal layers
3. May contain fossils