Transcript sediments
ACTIVITY 30 CHALLENGES OF THE MISSISSIPPI DELTA Challenge: How has the Mississippi River challenged the people of New Orleans? http://app.discoveryeducation.com/player/view/assetGuid/8F6A7F38-63AA-4CD6AD45-A5653CE8C6C4 KEY VOCABULARY A river channel describes the path of a riverbed that is carved into the land. A geologist is a scientist who studies rocks, minerals and other non-living (i.e., abiotic) parts of the earth. An engineer is a person who uses scientific knowledge to solve practical problems. Engineers are involved in designing most items that are used in everyday life. An ecologist is a scientist who studies the interrelations of organisms with each other and with their environment. GETTING STARTED 1. Copy the following three lists of terms . . . LIST 1 LIST 2 LIST 3 sediments deposition marsh water average deposition weathered rocks floodplain sediments erosion sediments mouth of river topographic map slowing water rainfall movement constructive force delta 2. Look for a relationship between the words in each list. 3. Cross out the one term that does not belong in the group. 4. Circle the term that should be the title of the list. STILL GETTING STARTED LIST 1 sediments water weathered rocks EROSION topographic map movement EROSION is the movement of weathered rocks, or sediments, by water, ice and air. STILL GETTING STARTED LIST 2 DEPOSITION average floodplain sediments slowing water constructive force DEPOSITION is a constructive force that happens when slowing water drops sediments onto a floodplain. FINALLY DONE GETTING STARTED! LIST 3 marsh deposition sediments mouth of river rainfall DELTA A DELTA, or marsh, is a place where the deposition of sediments occurs at the mouth of a river. RIVER SYSTEMS Both large river systems, like the Mississippi, or small river systems, like the Rolling River in Boomtown, have a natural balance of erosion and deposition. This balance of erosion and deposition, creates ongoing changes in deltas, as the land is built up by deposition, lost through erosion, and replenished during floods . What do you think happens if the balance between those two processes is disturbed? In this activity, you will investigate what has happened to the natural cycle of erosion and deposition along the Mississippi River in southern Louisiana. PROCEDURE: PART 1 Read the introduction on page 28. Each member of your group will play the role of a different person as you read the transcript aloud . . . Teresa Corelli (interviewer for Student Science Hour) Natalie Ludlow (ecologist) Dr. K.C. Sandoval (geologist at Boomtown University) Ethan Porter (engineer from Builders, Inc.) Read the interview on pages 29-33. PROCEDURE: PART 2 After finishing the reading, groups should discuss the question, “What can the people of New Orleans do about the long-term problem they face?” After discussing the question above, complete the “Intra-Act Discussion: Challenges of the Mississippi Delta” sheet for all four roles. This should be completed individually – not as a group. Each group member should share their opinion about each statement and explain why they agreed or disagreed. ANALYSIS QUESTIONS (PAGE 34) Work in your groups to answer questions #1, #2 and #3. (#3 should read, “Compare and contrast . . .”) Answers should be written in your journal. ANALYSIS ANSWERS (#1) 1. Some of the major problems that New Orleans faces include: flood risk; the loss of wetlands in the delta; the land sinking in the city; and, the potential for the river to change its channel. ANALYSIS ANSWERS (#2) Erosion and deposition relate to the problems in New Orleans because they are the primary earth processes in that region. The natural balance of these two earth processes has been disrupted by humans. The river’s inability to drop sediments in the new Orleans area has contributed to the problems listed in your answer to question #1. ANALYSIS ANSWERS (#3) 3A. Compare (i.e., similarities) Both Both Both Both communities have a delta. have a river system. have a marsh. are concerned about the safety of the community. 3B. Contrast (i.e., differences) No structures have been built on Boomtown’s Delta Marsh. Boomtown has a much smaller river system. Boomtown has a smaller population. New Orleans experienced a devastating event. Boomtown is a fictitious community.