![]() ![]() ![]() How Lakes Are Formed All lakes fill bowl-shaped depressions in the Earth’s surface, called basins. Surrounding the Great Salt Lake are salt flats, areas where the lake has evaporated, leaving only stretches of white salt. state of Utah, is the largest saline lake in North America. This is because as the water evaporates, it leaves behind solids-mostly salts. Closed lakes usually become saline, or salty. If water only leaves a lake by evaporation, the lake is closed. If water leaves a lake by a river or other outlet, it is said to be open. The water in lakes comes from rain, snow, melting ice, streams, and groundwater seepage. It is more than 395 meters (1,300 feet) below sea level. The lowest lake is the Dead Sea, between Israel and Jordan. It is about 3,810 meters (12,500 feet) above sea level. One of the highest is Lake Titicaca, in the Andes Mountains between Bolivia and Peru. Lakes exist at many different elevations. Other lakes are so shallow that a person could easily wade across them. Although Lake Baikal covers less than half the surface area of Lake Superior-one of North America’s Great Lakes-it is about four times deeper and holds nearly as much water as all five of the Great Lakes combined. Its bottom is nearly 2 kilometers (more than 1 mile) below the surface in places. The world’s deepest lake is Lake Baikal, in Russia. The Caspian Sea, in Europe and Asia, is the world’s largest lake, with an area of m ore than 370,000 square kilometers (143,000 square miles). Other lakes are so big that they are called seas. Such small lakes are often referred to as ponds. Some measure only a few square meters and are small enough to fit in your backyard. They are found on every continent and in every kind of environment-in mountains and deserts, on plains, and near seashores. There are millions of lakes in the world. If the statement is not true, produce a counterexample to it.A lake is a body of water that is surrounded by land. ![]() For each of these statements, determine whether it is true, and if so, determine the relationship between the fundamental periods of the two signals considered in the statement. Consider the following statements: (1) If x(t) is periodic, then Represents a slowed down version of x(t) in the sense that the duration of the signal is doubled. Represents a speeded up version of x(t) in the sense that the duration of the signal is cut in half. Let x(t) be a continuous-time signal, and let most occurs because the nutrients are brought the surface from turnover what temp water holds more oxygen cold what do ciscos require to live cold temp, and oxtgen what fish rely on cisco northern pike and walleye Which can get cold winter kill the death of water organisms caused by the depletion of oxygen in an ice-covered body of water spring turnover temp: starting to warm up again (39 degrees)įish can be everywhere what fish like cold temps cisco and trout algae blooms a rapid increase in the population and biomass of algae (phytoplankton) in an aquatic system. dead algae also consumes oxygen from belowįish: fish are moved to the top layers where oxygen is. Oxygen: since there is less light, plants don't create as much oxygen than they produce. Temp: top surface is getting cold from ice, Temp: cooling of surface, where thermocline is less distinct, temp is 39 everywhereĪlgae blooms winter stratification some layers form Oxygen: oxygen is lost in bottom part due to dead algae, making fish move up fall turnover mixing of many things due to wind Temp: warmer at top (can get too hot for some), cool bottom Happnes in spring summer stratification stratification zooplankton bloom some zooplankton are bioluminescent Rooted floating, non rooted floating, submerged, emgergentĪLGAE IS NOT A LAKE PLANT what fish can survive in most temp northern pike redtide Harmful algal blooms, or HABs, occur when colonies of algae-simple ocean plants that live in the sea-grow out of control while producing toxic or harmful effects on people, fish, shellfish, marine mammals and birds. Major chemicals released in decomposition? NH4 (ammonia)ĬH4 (methane) detritus Dead organic matter food web in lake big fish-> small fish -> zooplankton -> algae lake plants are very important in a lake ![]()
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