Geologic History of Long Island and LI Sound

Predict: Which agent(s) of erosion played the biggest role in forming the Long Island Sound? Wind and Ice Gravity and Water Ice and Water Water ONLY Activity 1: Long Island's Formation Please watch the video that shows a visual to help explain the formation of both Long Island and Long Island Sound. Be prepared to answer a few questions at the end of this activity on the topics discussed. Long Island's Formation Put the events describing the formation of Long Island in the video in order (Step 1-5). Step 1: An ancient river carved out the basin that would on day become the Long Island Sound Step 2: The glacier advanced and for about 1,000 years, remained in place discharging melt water and unsorted sediment. Step 3: A moraine was created by the glacial deposits that formed the South Shore of Long Island. Step 4: The glacier began to retreat due to melting and formed a second moraine in , line with the North Fork of Long Island. Step 5: The melting glacier caused sea levels to rise and salt water to fill in the Long Island Sound, giving LI the shape we see today. Meet Google Drive – One place for all your files Please use the link provided to read the article explaining the formation of the Long Island Sound. This article helps explain how Long Island was actually formed! Be prepared to answer a few questions at the end of this activity on the topics discussed. Activity 2: Geologic History of LI Sound Reading (Clickable Link) 200 million years ago, the "once majestic" Appalachian mountains were weathered to their core. What did this sediment event eventually create? The Appalachian Mountains The Atlantic Coastal Plain The Atlantic Ocean Before glaciation began (3 million years ago), what was the major erosional agent effecting the coastal plains of North America? Wave action Wind action Stream action What is the name of the last ice advance and when did it begin? Wisconsinan; 85,000mya Wisconsinan; 45,000mya Devonian; 85,000mya Devonian; 45,000mya The text discusses pauses in the glacial ice movement that created multiple "recessional moraines" on Long Island. Infer: What does the term "terminal" moraine mean? Pile of sediment deposited at the start of a glacier. Pile of sediment deposited at the end of a glacier. Pile of sediment deposited in the middle of a glacier. According to the reading, what event marked the birth of "The Long Island Sound"? Fall of sea level due to the freezing of the glacier over the LI Sound Rise of sea level due to the melting of the glacier into LI Sound The retreat of the Wisconsinan Glacier back into Canada