rocks and weathering Flashcards
What is chemical weathering
Caused by the action of water,rainwater contains small amounts of acid.When the rainwater comes into contact with rock the acid causes the rock to crumble away
Main type of rock in Country Down
Gritstones and shales
What is biological weathering
Seeds fall into cracks in the rocks where they grow into small plants or trees. As they grow they force the cracks to widen and the rock to fall apart
What is an Ammonite
Ammonites are related to squids and octopuses. Their shell is usually a flat spiral shape which is made up of chambers.
Main rock of Tyrone
Limestones,sandstones and coal
Main rock of Armagh
Gritstones and shales
Sedimentary rock
Formed when sediments compact and cement into layers from eroded rocks.These can contain fossils
Where are fossils found?
Sedimentary rock
Steps of fracking
- A vertical well is dug into the ground
- A horizontal well is drilled miles underground through shale rock
- “slick” water is pumped into the well forcing fissures to widen
- Proppants (tiny grains like sand) hold fissures open
- Rock is opened up and gas is released
- Gas is flushed to the surface and collected
Igneous rock
Forms when molten rock cools,often contains crystals
Fossil
The NATURALLY PRESERVED remains or traces of plants and animals that’re found in rocks
bivalves
Soft bodied animals that have 2 shells. These shells are usually mirror images of eachother
Cementation
Where new materials stick the grains of a rock together
Compaction
When sediments are deeply buried,placing them under pressure because of the weight of overlying layers,squashing the grains together more tightly
Metamorphic rock
Formed when rock changes under pressure and pressure existing rocks transformed
