Forming/Transporting Rock Particles
How are particles broken away from rocks?
How do sediments form rocks?
By getting pressed together.
What is coal made up of?
Remains of plants - dead wood, bark leaves, stems and roots.
What do water in oceans, lakes, rivers, and streams contain?
Minerals that came from rocks
Where are the oldest layers for sedimentary rocks?
At the bottom
Boulders to sand to tiny bits of clay.
Are sedimentary rocks created by layering?
Yes, one layer gets buried by another and then another.
Why is coal an unusual sedimentary rock?
It forms from plants instead of earlier rocks
What dissolves and transport minerals?
Water
How can sedimentary rocks tell us about the past?
Fossils of fish or shells in a layer of rock show that the area was covered by a lake or an ocean.
What is the path that particles have to take to get to a lake or oceans?
Water carries these rock particles to streams and rivers, which eventually empty into lakes and oceans.
What sediments need pressure alone to be formed into a rock?
Slit and clay
What is limestone made up of?
Carbonate minerals, such as calcite.
What happens to limestone when water goes through it?
Some of the rock dissolves
How are crossbeds formed?
Layers were once moving sand dunes
Can wind move particles to different locations?
How do minerals affect rocks?
Crystallization between them, acts as cement.
Where do most limestone come from?
Where do minerals crystallize along the edges of lakes and ocean?
Where the climate is dry and a lot of water evaporates quickly.
How can geologist tell the direction water was moving?
If the sand had been buried and cemented into sandstone
What do sediments form?
Layers as larger particles settle first, followed by smaller ones.
True or false that sedimentary rocks produce rocks from shells or plant remains.
True
Organisms build their skeletons on top of one another.
How do rock salt and gypsum form?
When minerals build up and form layers of sedimentary rock.
What do mud cracks show?
Rocks were formed in areas where wet periods were followed by dry periods.