Rock Worksheet II Sedimentary Rocks

Rock Worksheet II—Sedimentary Rocks Name: ______

I. Most of the rocks on the surface of the earth are ______

rocks. They are made from ______which are small pieces of rock

and organic material. These were formed by ______of larger rocks

and the remains of plants and animals. These sediments were then carried by the

process of ______and deposited. After many layers accumulated,

the pressure caused the bottom layers to compress and form rock, a process called

______. Another process, ______, used the

evaporation of the fluids present in the sediments to glue them together.

II. Sediments are grouped according to ______and

______. The smallest sediments are called ______, the

next smallest are ______, then ______, and the largest are

______. Different rocks are formed from different sizes of

sediments. One group of sedimentary rocks, the ______rocks, is

made up of broken fragments of rock. These rocks are named based on the

______of the sediments and the roundness of the grains.

Clastic Rocks Rock Sediment 1. sandstone

2. shale

3. siltstone

4. conglomerate

III. A second group of sedimentary rocks is called ______because these rocks are formed from ______of fluid which

leaves the chemicals behind that form the rock. An example is

______. It contains a lot of the mineral ______.

IV. Orgainc sedimentary rock is made up mostly of ______(material

from once living things). ______is also an example of this type of

rock formed from shells of marine organisms. Coquina is an example of

limestone with ______shell fragments. Microscopic shell remains

make up ______which forms the White Cliffs of Dover.

MOST OF THE TIME ONLY SEDIMENTARY ROCK WILL CONTAIN ______.