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Unit 10

Troy Gyant , Jonathan Lloyd, Meghan Piercy. Unit 10 . WWK. Understand that precipitation and excessive pumping leads to saltwater intrusion and changes in groundwater levels. Can excessive pumping of underground water cause a sinkhole to form?.

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Unit 10

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  1. Troy Gyant, Jonathan Lloyd, Meghan Piercy Unit 10

  2. WWK • Understand that precipitation and excessive pumping leads to saltwater intrusionand changes in groundwater levels.

  3. Can excessive pumping of underground water cause a sinkhole to form? • Dewatering - The removal of water from solid material or soil by wet classification. • Buoyancy - An upward force exerted by a fluid, that opposes the weight of an immersed object. • Yes. Many sinkholes have formed due to dewateringof underground voids. The soil arch over a void is most of the timepartially supported by the buoyancy of the water table. • When the water is removed and the soil material above the void becomes wet from excessiverainfall, it may collapseand form a sinkhole.

  4. Saltwater intrusion in South Florida • 90 percent of Southern Florida gets its drinking water from underground supplies. Pumping too much water from underground supplies can allow saltwater to push in from the coast. • Saltwater Intrusion – the movement of saline water into freshwater aquifers. • Droughts can make saltwater intrusionworse. During a drought, rain doesn't come to replenish underground freshwater supplies, therefore causing more pumping from underground supplies to provide drinking water. This makes saltwater intrusion more severe.

  5. K.S. • What is a Saltwater Intrusion?

  6. Video.. • http://www.youtube.com/watch?v=e1d5wggJ-0g

  7. WWK • We will know and understand the changes in transgressive and regressive sedimentary sequencescaused by changes in the sea level.

  8. Transgressive Sedimentary Changes and its Effects • A transgressive sedimentary change is when a glacier melts, which causes a rise in the height of the sea level, causing deposition. • This change in sea level can affect the living and nonliving areas around the area being transgressed.

  9. Regressive Sedimentary Changes and their Effects • A regressive sedimentary changes are caused when two tectonic plates collide and both submerge, one under the other, causing a drop in the sea level. • This change in the sea level can cause earthquakes when the plates collide and will change the shape of the ground at the point of the collision.

  10. Overall Effects of Sedimentary Changes in the Ocean Floor • The rise and dropping of the sea level reshape the planet. We do not notice it by the day, but as time goes on, the earth’s crust is slowly changing.

  11. Kick Starter • What is a cause of a change in the sea-level? • http://www.youtube.com/watch?v=_4YUieDlAuM

  12. WWK • The students will be able to explain how global ocean circulation is the result of wind, tides, and water density.

  13. What is global ocean circulation? • They are continuous and directed movements of ocean water. These currents are on the ocean’s surface and below, flowing both locally and globally.

  14. How does wind and the Earth’s rotation affect it? • Earth’s rotation results in the Coriolis Effect, which is the deflective force of the Earth’s circulation on the ocean water that causes the water to circulate throughout the Earth. • Wind and ocean currents get deflected from a straight path as the Earth rotates. This causes ocean currents to rotate to the right in the Northern hemisphere and oscillate to the left in the Southern. • Surface currents, which cause waves (the movement of water caused by wind), are conducted by global wind systems that are fueled by the sun. The wind pushes the water from the tropics to the polar regions, influencing ocean circulation.

  15. How do tides influence ocean circulation? • Rip currentsare very strong, narrow surface currents that flow rapidly away from the shore, returning the water carried toward the land by waves. • Working along with wind, tides create rip currents and coastal currents. • Tides make the ocean level rise with the cycle of the moon. • Tides are the regular fall and rise of sea level, and are caused by the gravitational pull between the sun and the moon. • The gravitational attraction of the moon pulls ocean water nearest it away from the earth and at the same time pulls the earth away from the water farthest away.

  16. What about water density? • Water density is the result of temperature and salinity. The salt water is denser than normal water, so it sinks. • The currents pick up this water with the rise and fall of the tides and transports it throughout the globe. • Around the colder regions, ocean water loses heat to the atmosphere, and the water becomes colder and denser. In result, it sinks. • With the help of the Coriolis Effect, the warm and cold ocean water are distributed to each corner of the globe with the rise and fall of the tides and the wind creating surface currents.

  17. K.S. • How do the wind, tides, and water density contribute to global ocean circulation? …Yes, this answer is more than 3 or 4 words.

  18. Video • http://www.youtube.com/watch?v=Hu

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