https://padlet.com/320767/osqektvvq8q6 Because I had to do dis ting en-us 2018-04-30 14:45:28 UTC 2018-05-16 14:05:42 UTC hello@padlet.com 320767 https://padlet.com/320767/osqektvvq8q6/wish/256543793 Fossils are the preserved remains of organisms that were once living]]> 2018-04-30 14:47:34 UTC https://padlet.com/320767/osqektvvq8q6/wish/256543793 320767 https://padlet.com/320767/osqektvvq8q6/wish/256544699 Only 10% of fossils will become fossils. The other 90% is destroyed before that happens.]]> 2018-04-30 14:49:15 UTC https://padlet.com/320767/osqektvvq8q6/wish/256544699 320767 https://padlet.com/320767/osqektvvq8q6/wish/256545148 Nearly all fossils are found in sedimentary rock]]> 2018-04-30 14:50:04 UTC https://padlet.com/320767/osqektvvq8q6/wish/256545148 320767 https://padlet.com/320767/osqektvvq8q6/wish/256546038 There are 6 main types of fossils.]]> 2018-04-30 14:51:33 UTC https://padlet.com/320767/osqektvvq8q6/wish/256546038 320767 https://padlet.com/320767/osqektvvq8q6/wish/256547692 Molds- The hollow space left by the organism]]> 2018-04-30 14:54:01 UTC https://padlet.com/320767/osqektvvq8q6/wish/256547692 320767 https://padlet.com/320767/osqektvvq8q6/wish/256547854 Casts- creates an exact copy of le organism]]> 2018-04-30 14:54:16 UTC https://padlet.com/320767/osqektvvq8q6/wish/256547854 320767 https://padlet.com/320767/osqektvvq8q6/wish/256548418 Petrified fossils- organism is turned to stone]]> 2018-04-30 14:55:08 UTC https://padlet.com/320767/osqektvvq8q6/wish/256548418 320767 https://padlet.com/320767/osqektvvq8q6/wish/256549237 Carbon Films- an organism leaves behind a thin layer of carbon. Very rare.]]> 2018-04-30 14:56:35 UTC https://padlet.com/320767/osqektvvq8q6/wish/256549237 320767 https://padlet.com/320767/osqektvvq8q6/wish/256550326 Trace fossils- organisms leave clues behind]]> 2018-04-30 14:58:37 UTC https://padlet.com/320767/osqektvvq8q6/wish/256550326 320767 https://padlet.com/320767/osqektvvq8q6/wish/256550966 Perserved remains- tar, ice, or amber]]> 2018-04-30 14:59:58 UTC https://padlet.com/320767/osqektvvq8q6/wish/256550966 320767 https://padlet.com/320767/osqektvvq8q6/wish/256554380 Archaeologists study the history of humans through ancient artifacts.
Paleontologists study former life of animals that lived millions of years ago.]]> 2018-04-30 15:07:20 UTC https://padlet.com/320767/osqektvvq8q6/wish/256554380 320767 https://padlet.com/320767/osqektvvq8q6/wish/256560263 When they died, the were covered by mud. It turned to rock and eventually, that rock became mountains.]]> 2018-04-30 15:18:43 UTC https://padlet.com/320767/osqektvvq8q6/wish/256560263 320767 https://padlet.com/320767/osqektvvq8q6/wish/257686737 The relative age of a rock is its age compared to the ages of other rocks. ]]> 2018-05-03 14:49:33 UTC https://padlet.com/320767/osqektvvq8q6/wish/257686737 320767 https://padlet.com/320767/osqektvvq8q6/wish/257688186 The absolute age of a rock is the number of years that have passed since the rock formed.]]> 2018-05-03 14:51:28 UTC https://padlet.com/320767/osqektvvq8q6/wish/257688186 320767 https://padlet.com/320767/osqektvvq8q6/wish/257689116 Fossils are most often found in layers of sedimentary rock. Geologists use the law of superposition to determine the relative ages of sedimentary rock layers. According to the law of superposition, in undisturbed horizontal sedimentary rock layers that oldest layer is at the bottom. Each higher layer is younger than the layers below it.]]> 2018-05-03 14:52:40 UTC https://padlet.com/320767/osqektvvq8q6/wish/257689116 320767 https://padlet.com/320767/osqektvvq8q6/wish/257691704 Lava that hardens on the surface and form igneous rock is called an extrusion. An extrusion is always younger than the rocks below it. Magma may push into bodies of rock below the surface. There, the magma cools and hardens into a mass of igneous rock called an intrusion. An intrusion is always younger than the rock layers around and beneath it.]]> 2018-05-03 14:56:15 UTC https://padlet.com/320767/osqektvvq8q6/wish/257691704 320767 https://padlet.com/320767/osqektvvq8q6/wish/257694555 More clues come from the study of faults. A fault is a break in the Earth's crust. Forces inside Earth cause movement of the rock on opposite side of a fault/ A fault is always younger than the rock it cuts through. To determine the relative age of a fault, geologists find the relative age of the youngest layer cut by the fault.]]> 2018-05-03 15:01:22 UTC https://padlet.com/320767/osqektvvq8q6/wish/257694555 320767 https://padlet.com/320767/osqektvvq8q6/wish/257697355 To date rock layers, geologists first find the relative age of a layer of rock at one location. Then they can match layers in other locations to that layer. Certain fossils, called index fossils, help geologists match rock layers. To be useful as an index fossil, a fossil must be widely distributed and represent an organism that existed for a geologically short period of time. Index fossils are useful because they tell the relative ages of the rock layers in which they occur. Scientists infer that layers with matching index fossils are the same age.]]> 2018-05-03 15:06:24 UTC https://padlet.com/320767/osqektvvq8q6/wish/257697355 320767 https://padlet.com/320767/osqektvvq8q6/wish/257700794 When rock layers erode away, an older rock surface may be exposed. Then deposition begins again, building new rock layers. The surface where new rock layers meet a much older rock surface beneath them is called an unconformity. An unconformity is a gap in the geologic record. It shows where layers have been lost due to erosion]]> 2018-05-03 15:12:49 UTC https://padlet.com/320767/osqektvvq8q6/wish/257700794 320767 https://padlet.com/320767/osqektvvq8q6/wish/260889747 It's a record of the geologic events and the evolution of life forms]]> 2018-05-15 15:13:23 UTC https://padlet.com/320767/osqektvvq8q6/wish/260889747 320767 https://padlet.com/320767/osqektvvq8q6/wish/260890191 It covers about 88 percent of earth's history]]> 2018-05-15 15:14:29 UTC https://padlet.com/320767/osqektvvq8q6/wish/260890191 320767 https://padlet.com/320767/osqektvvq8q6/wish/260890450 Geologists divide the time between Precambrian time and the present into three long units of tie called eras]]> 2018-05-15 15:15:08 UTC https://padlet.com/320767/osqektvvq8q6/wish/260890450 320767 https://padlet.com/320767/osqektvvq8q6/wish/260890927 Eras are subdivided into units of geologic time called periods]]> 2018-05-15 15:16:21 UTC https://padlet.com/320767/osqektvvq8q6/wish/260890927 320767 https://padlet.com/320767/osqektvvq8q6/wish/260891224 Earth started as a ball of dust, rock, and ice in space. Gravity pulled the masses together]]> 2018-05-15 15:17:09 UTC https://padlet.com/320767/osqektvvq8q6/wish/260891224