Question 8 (10 points) d Crystal wedging occurs when: a) Mineral crystals precip

Question

Question 8 (10 points) d Crystal wedging occurs when: a) Mineral crystals precipitate in a fracture and exert pressure on the walls of the fracture b) Water freezes in cracks, forming ice crystals that exert pressure on the rock c) Water seeps into cracks and dissolves the minerals along the walls of the crack d) The mineral crystals in a rock heat up and expand Save Question 9 (10 points) Which is the best example of an oxidation-reduction reaction? a) Pyrite reacts with oxygen and water, resulting in the formation of sulfuric acid. b) Potassium feldspar reacts with hydrogen ions and water to form clay minerals. c) Water reacts with calcite, breaking down the calcite into calcium and bicarbonate ions. d) Olivine reacts with water to form serpentine.

Explanation / Answer

8. Crystal wedding occurs when water freezes in cracks, forming ice crystal that exert pressure on the rock.

This is a type of mechanical or physical weathering and is called forst wedging also. In this process water enters through the cracks of the rock and then freezes. While freezing it exerts a pressure on the rock wall causing disintegration of the crystal. This is known as crystal wedging.

9. The best example of oxidation reduction is pyrite reacts with oxygen and water, resulting in the formation of sulfuric acid.

Oxidation reduction or redox reaction is a type of Chemical reaction in which electron exchange occurs. The donor electron is a reducing agent and the oxidising agent is an acceptor. In the reaction of pyrite, at first the oxidation takes place producing ferrous and sulfuric acid and later on reduction takes place.

Related Questions

Navigate

• Browse (All)
• Browse Q
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.