Today's continents were formed when the giant landmass Pangaea separated into smaller continents, due to plate tectonics. Pangaea was a collection of earlier continents.
Initially, Pangaea broke apart into two large areas, known as Gondwana and Laurasia. Gondwana was made up of what became Australia, India, South America, Africa and Antarctica while Laurasia was composed of Europe, North America and Asia. Eventually, North America split from Laurasia, and South America split from Gondwana, pushed apart by plate tectonics. India split from Gondwana and ran into Asia, creating the Himalayas. Australia and Antarctica also broke off of Gondwana.
Plate tectonics is the theory that the Earth's top layer is composed of a series of plates that move over the hotter layers below. They are pushed apart at continental ridges, like the one in the Atlantic Ocean. Fault lines and subduction zones can also affect how they move.Learn More
One of the key purposes of the introduction to a science project is setting forth or outlining the purpose of the project in a clear, concise manner. The introduction summarizes how the science project is to work or proceed from start to finish. The intro must also delineate what results are expected through the project as well as how those results are to be analyzed or utilized.Full Answer >
The most popular and influential incentive given to early American settlers was the promise of free land in the Homestead Act of 1862. Another important incentive was the excitement of the unknown and the freedom offered to anyone willing to accept a fresh start.Full Answer >
A narrative paragraph tells the story of an event, providing the relevant details of when and where the event occurred as well as who was included and what transpired. The paragraph describes either an actual event or a fictional one that the writer creates.Full Answer >
America has a two-party system because two parties broke away early in the formation of the United States and stood out immediately without any additional parties. Both parties have existed for more than 150 years and it is difficult for new parties to enter the system because voters know that those parties are less established and are less likely to have the chance to win a position.Full Answer >