1. Coal mines are common in Pennsylvania. What was the environment of Pennsylvan
ID: 804068 • Letter: 1
Question
1. Coal mines are common in Pennsylvania. What was the environment of Pennsylvania in the past compared to today
2. There is a thick layer of limestone with many shells under Chicago. What can you figure out about the geologic past of that area
3. You are at the beach with a friend and find pebbles and some slightly larger rocks. Explain why you would not call these sedimentary rocks.
4. An area has a layer of sandstone that is interpreted to have once been a beach. On top of that sandstone is a layer of limestone that formed deep in the ocean. What can you say about the sea level of this area?
5. Two students are debating about how layers of sandstone and shale (mudstone) relate to rising sea level
Student 1: Sandstones forms from sand deposited right at the ocean's edge and shale forms from sediments deposited in deeper water. So, if the water was shallow first, and then it got deeper, sandstone would be the first layer deposited so it is on the bottom, and shale would be on the top.
Student 2: But if the water is getting deeper, that means the shale should be deeper because it forms from sediments deposited in deeper water. So, I think after the sand is deposited the mud that will turn into shale would sink under the sand and form a layer there because it forms in deeper water.
With which student do you agree? Why
Explanation / Answer
1) swamp
Since coals form under swampy conditions we can say that the past climate of Pennsylvania is swampy.
2) marine , presence of fosiil shells indicaate shallow marine environment
3) because they are unconsolidated, we call a rock only when it is in lithified form
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.