ROQ 3

Question 1

T/F: Chalk deposits usually form when sea water rich in calcium carbonate and shell fragments is cut off from the open ocean (or flows in to a dry lake bed) and evaporates.

Answer 1

False. This mostly applies to halite and gypsum. Chalk formations involve the accumulation of CaCO3 from the skeletal remains of microorganisms.

Question 2

If a clastic sedimentary rock consists of larger clasts surrounded by much smaller clasts, then the mass of the smaller grains is called the _______ of the rock.

Answer 2

matrix

Question 3

What force breaks down solid rock down into ions and sediment grains?

Answer 3

Weathering

Question 4

Younger sedimentary rock formations are almost always formed on top of older rock formations. Place the five formations in order from youngest to oldest.

Answer 4

Kaibab, Toroweap, Coconino, Hermit, Supai (KTCHS to remember!)

Question 5

T/F: Jointing only occurs in sedimentary rocks along weakened bedding surfaces.

Answer 5

False. It can also occur in igneous and metamorphic rocks and isn’t limited to weaker areas.

Question 6

Limestone can be formed from _________ and ________ through __________

Answer 6

dead plankton, ancient coral reefs, lithification