https://padlet.com/304807/ntabn8peopwc en-us 2018-04-26 16:24:13 UTC 2018-04-26 16:28:50 UTC hello@padlet.com 304807 https://padlet.com/304807/ntabn8peopwc/wish/255726386 the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.]]> 2018-04-26 16:25:23 UTC https://padlet.com/304807/ntabn8peopwc/wish/255726386 304807 https://padlet.com/304807/ntabn8peopwc/wish/255726549 compaction. (kəm-pāk'shən) The process by which the porosity of a given form of sediment is decreased as a result of its mineral grains being squeezed together by the weight of overlying sediment or by mechanical means. The American Heritage® Science Dictionary]]> 2018-04-26 16:25:45 UTC https://padlet.com/304807/ntabn8peopwc/wish/255726549 304807 https://padlet.com/304807/ntabn8peopwc/wish/255726721 a process of altering a metal by heating it in contact with a powdered solid, especially a former method of making steel by heating iron in contact with charcoal]]> 2018-04-26 16:26:05 UTC https://padlet.com/304807/ntabn8peopwc/wish/255726721 304807 https://padlet.com/304807/ntabn8peopwc/wish/255726891 In geology and related fields, a stratum is a layer of sedimentary rock or soil, or igneous rock that were formed at the Earth's surface, with internally consistent characteristics that distinguish it from other layers]]> 2018-04-26 16:26:25 UTC https://padlet.com/304807/ntabn8peopwc/wish/255726891 304807 https://padlet.com/304807/ntabn8peopwc/wish/255727109 the process of eroding or being eroded by wind, water, or other natural agents.]]> 2018-04-26 16:26:47 UTC https://padlet.com/304807/ntabn8peopwc/wish/255727109 304807 https://padlet.com/304807/ntabn8peopwc/wish/255727300 the process of eroding or being eroded by wind, water, or other natural agents.]]> 2018-04-26 16:27:07 UTC https://padlet.com/304807/ntabn8peopwc/wish/255727300 304807 https://padlet.com/304807/ntabn8peopwc/wish/255727522 The Rock Cycle is a group of changes. Igneous rock can change into sedimentary rock or into metamorphic rock. Sedimentary rock can change into metamorphic rock or into igneous rock. Metamorphic rock can change into igneous or sedimentary rock. Igneous rock forms when magma cools and makes crystals.]]> 2018-04-26 16:27:32 UTC https://padlet.com/304807/ntabn8peopwc/wish/255727522 304807 https://padlet.com/304807/ntabn8peopwc/wish/255727686 Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means "change in form". The original rock is subjected to heat and pressure, causing profound physical or chemical change.]]> 2018-04-26 16:27:51 UTC https://padlet.com/304807/ntabn8peopwc/wish/255727686 304807 https://padlet.com/304807/ntabn8peopwc/wish/255727868 Rock that has formed through the deposition and solidification of sediment, especially sediment transported by water (rivers, lakes, and oceans), ice ( glaciers ), and wind. Sedimentary rocks are often deposited in layers, and frequently contain fossils. Note : Limestone and shale are common sedimentary rocks.]]> 2018-04-26 16:28:13 UTC https://padlet.com/304807/ntabn8peopwc/wish/255727868 304807 https://padlet.com/304807/ntabn8peopwc/wish/255728079 Igneous rock, or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic. Igneous rock is formed through the cooling and solidification of magma or lava]]> 2018-04-26 16:28:40 UTC https://padlet.com/304807/ntabn8peopwc/wish/255728079