Geology 101 Exam 3 TAMU questions with correct answers

Detrital rocks CORRECT ANSWER transported sediment as solid particles -Chief constituents of detrital rocks are Quartz, Feldspars, Micas, Clay minerals (the silicate minerals) 'Chemical' rocks CORRECT ANSWER sediment composed of minerals that were once in solution [biochemical is a better name for them, because many are formed from biologic processes] What are sediments? CORRECT ANSWER Sediments are products of mechanical and chemical weathering and deposited on the Earth surface Often contain fossils Provide information about sediment transport and environment of deposition May contain: Coal, oil, natural gas; ores of iron, aluminum How many sediment grain sizes are there? CORRECT ANSWER 3: gravel, sand, mud gravel CORRECT ANSWER arger than 2mm diameter -Gravel is moved by very high energy flow (major flood flow or debris flow) sand CORRECT ANSWER 2 mm to 62 micron size -Sand is pushed along river beds and beaches Mud CORRECT ANSWER maller than 62 micron diame