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In any arrangement or community, the “keystone” is considered one of the most vital parts. In a marine ecosystem, or any type of ecosystem, a keystone species is an organism that helps hold the system together. Without its keystone species, ecosystems would look very different. Some ecosystems might not be able to adapt to environmental changes if their keystone species disappeared. That could spell the end of the ecosystem, or it could allow an invasive species to take over and dramatically shift the ecosystem in a new direction. ...
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ERP On-Demand Symposiums ; ERP First Steps ; Maintaining Recognition ; Samples and Templates ; Educational Tools & Resources ; Log in to ERP University ; Chronicle Diabetes
The Silk Road is neither an actual road nor a single route. The term instead refers to a network of routes used by traders for more than 1,500 years, from when the Han dynasty of China opened trade in 130 B.C.E. until 1453 C.E., when the Ottoman Empire closed off trade with the West. German geographer and traveler Ferdinand von Richthofen first used the term “silk road” in 1877 C.E. to describe the well-traveled pathway of goods between Europe and East Asia. The term also serves as a metaphor for the exchange of goods and ideas between dive ...
greenhouse gas produced by animals during respiration and used by plants during photosynthesis. Carbon dioxide is also the byproduct of burning fossil fuels. ; chemical compound mostly used in refrigerants and flame-retardants. Some CFCs have destructive effects on the ozone layer. ; coal, oil, or natural gas. Fossil fuels formed from the remains of ancient plants and animals.
King Tutankhamen—or King Tut as he is more commonly known today—was relatively unknown to the world until 1922, when his tomb was discovered by Howard Carter. His tomb contained thousands of artifacts, a sarcophagus containing his mummy, and a now-famous headdress. It took Carter and his team almost ten years to catalog the contents of the tomb. Since the tomb's discovery, King Tut has become the world's most well-known Egyptian pharaoh, fascinating generations of scientists and students. ...
Grades : 4 - 12, Subjects : Earth Science, Astronomy, Social Studies, U.S. History, World History
Grades : 4 - 12+, Subjects : Biology, Ecology, Earth Science, Meteorology, Geography, Human Geography, Physical Geography