1. Place all books and notes on the floor. 2. Read each question carefully, then read it again

1. Place all books and notes on the foor 2. Read each question carefully, then read it again 3. Think before you write

1. What is the significance of the concept of \principal stress\? 2. Sketch a 2D stress ellipse for the case 01=5GPa and 02= 2GPa where 01 is vertical

1. Draw a 2 dimensional Mohr Circle representation for the following stress conditions

1. Calculate the force at the base of a continental block that has a uniform thickness of 25km, length of1000km, width of500km, and density of2.70. What is the stress on the bottom of the block?

Complete the block diagrams for the following features. Be sure to include the appropriate map symbols on your drawings. Inclined anticline with hinge surface

September 8, 2000 1. Describe the difference between slip and separation on a fault. 2. What type of offset() can be interpreted from the map below? Give a detailed description of your logic on the back of the page

1. Interpret the geologic history of the Grand Canyon using the diagram below. List the events in order from the oldest (at the bottom of the page) to the youngest(at the top of the page). For each event describe the principle or observation you used

• 节理分类 • 雁列节理 • 节理的岩脉充填机制和压溶作用 • 区域性节理

伸展构造类型 伸展构造模式 剥离断层与变质核杂岩 剥离断层与变质核杂岩 重力滑动构造