Define Differential Weathering=
Softer rock wears away leaving harder rock behind.
DOUBLEDAPOINTS: Name 3 ways rocks can weather MECHANICALLY.
Ice, frost action, ice wedging, frost heaves, Abrasion, (Wind, Water, Gravity) Exfoli, plants, animalsation
What is the difference between parent and bedrock???
Parent rock is the rock soil actually comes from and bedrock is the rock directly beneath a layer of soil.
When talking about soil, if you consider the particle sizes and 'feel' of it, you are talking about the soil's ________.
Texture
What type of rock weathering forms RUST?
Oxidation!
When farmers plow across the slope of a hill it's called...
contour plowing
what farming technique moves crops around so they aren't in the same place?
Crop rotation
How do you describe 'No-Till' farming?
The practice of leaving old stalks on the soil so the rain doesn't wash it away.
What is it called when farmers make little steps in their fields- a series of smaller, flatter fields instead of a hill?
terracing
DOUBLEDAPOINTS: Name 3 ways rocks can weather CHEMICALLY
Water, Acid Precipitation in rain, snow, sleet, sulfuric and nitric acids, acid groundwater, acids inliving things (lichens) and air (oxidation)
What is the term for when soft rocks wear away fastesr leaving harder rocks behind?
Differential Weathering.
What are the series of LAYERS in a cross section of soil called?
Horizons