EAR 105 Lecture Notes - Lecture 9: Banded Iron Formation, Orthoclase, Clay Minerals
15 Feb 2018
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What are two main categories of weathering and how do they differ: physical, chemical. What factors determine the rate at which a rock weathers: multiple choice: all of the factors affect rates of weathering except for, rock characteristics, surface area, climate, geological age of earth materials, multiple choice: chemical weathering: Increases with acidity: all of the above. Sediment clasts carried by water or wind. I(cid:374)(cid:272)ludes s(cid:373)all pe(cid:271)(cid:271)les, sa(cid:374)d, silt, (cid:373)ud, a(cid:374)d orga(cid:374)i(cid:272) (cid:373)aterials (e(cid:448)e(cid:374) though they"re (cid:374)ot rocks, they make up rocks) Not a strong enough current to carry boulders. Dissolution break down of crystal lattices into individual ions, atoms, molecules. Occurs when you have soluble minerals that are ionically bonded. Oxidation occurs when oxygen combines with another substance and creates a compound called oxide. Rust (when iron combines with oxygen) iron oxide: fe2o3 - hematite, also known as natural rust. Iron in rocks comes from pyroxene, amphiboles, and micas.
