VOCAB 1
Foliation is?
Foliation develops when Metamorphic rocks are under pressure.
Can animals affect the rate of weathering?
No.
Surface area, composition and climate only.
When does foliation occur?
when the rock is under high pressure.
Can a desert climate increase the speed of weathering?
Yes :)
Define: Nonfoliated Rock
hard rocks with often only one mineral that will not split into layers.
Which of these is the main cause of Chemical Weathering? AIR, FROST, WATER?
Water is the main cause of this type of weathering. often by RUSTING AND DISSOLVING
Can slate be used for making tiles?
Yes because it can split into thin sheets.
When you take SHALE and use pressure to turn it into SLATE, what is that an example of?
Metamorphism
True or False: Dissolving is a type of mechanical weathering
False - it is chemical because it is the process of acidity in water melting away rock minerals and changing its composition.
What is recrystallization?
The process where mineral crystals bond / break down and atoms reform in new ways.
Abrasion is _____?
Wearing something down by friction, usually between two surfaces or objects. (think riverbeds or shorelines)
older rocks, plant material, shells, skeletons,
(these are considered: Sediments).
Rocks deeper into the earth will experience more of what?
foliation through greater pressure.
Explain Plant Root Growth
Roots grow between rock cracks and force the cracks apart. Making them bigger.
What is Mechanical Weathering?
Recrystallization.
How is chemical weathering different to mechanical weathering?
Chemical = composition changes
Mechanical = physical changes
Marble develops from limestone, how is it used?
It usually has only one mineral in it so is used in building and sculpting.
Which element is used in both types of weathering?
Water - combines with acidic things in chemical.
Freezes, causes abrasion or feeds roots to mechanically break rocks.
Define: Foliation
When minerals within rocks arrange into flat or wavy parallel bands.
Explain Chemical weathering?
Breakdown of rocks from chemical reactions which change the rocks composition (inside chemical makeup)
Can Sedimentary Rocks, OLDER Metamorphic rocks and Igneous Rock be called PARENT ROCKS?
Yes - all these three can be Parent rocks to new metamorphic rocks.
Can water evaporation, which leaves mineral deposits form metamorphic rock?
NO - you need heat, pressure - in a combination of both.
When Iron goes brown, which chemical weathering is that?
It is rusting. - rainwater is causing it to rust
Weathering is _______?
The process using natural forces to break down rocks over a long time