Wind carrying sand grains deposits the sand when the wind slows down or hits an obstacle.
Weatherman and scientist (The kind of scientist who studies weather).
Form from many older rock particles.
Geologic time scale
temperature humidity and pressure
The folding or tilting of rocks, followed by renewed deposition, has to occur to create an angular unconformity.
Hot and sunny. ;)
heated during metamorphism
One that's formed only from mechanical weathering.
A 60,000 year old mammoth bone.
The boundaries of history of eras are marked by great worldwide changes in continental coastline