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The cover to the Project 4.1 Final Report, "Study of Response of Human Beings Accidentally Exposed to Significant Fallout Radiation." Project 4.1 was the designation for a medical study and experimentation conducted by the United States of those residents of the Marshall Islands exposed to radioactive fallout from the March 1, 1954 Castle Bravo nuclear test at Bikini Atoll, which had an ...
The hatched areas were affected by wet conditions or flooding, and the dotted areas by drought or dust storms. [1] The 4.2-kiloyear (thousand years) BP aridification event (long-term drought), also known as the 4.2 ka event, [2] was one of the most severe climatic events of the Holocene epoch. [3] It defines the beginning of the current ...
In 2012, the head of AP Grading, Trevor Packer, stated that the reason for the low percentages of 5s is that "AP World History is a college-level course, & many sophomores aren't yet writing at that level." 10.44 percent of all seniors who took the exam in 2012 received a 5, while just 6.62 percent of sophomores received a 5.
The first eon in Earth's history, the Hadean, begins with the Earth's formation and is followed by the Archean eon at 3.8 Ga. [2]: 145 The oldest rocks found on Earth date to about 4.0 Ga, and the oldest detrital zircon crystals in rocks to about 4.4 Ga, [34] [35] [36] soon after the formation of the Earth's crust and the Earth itself.
Advanced Placement (AP) European History (also known as AP Euro, or APEH), is a course and examination offered by the College Board through the Advanced Placement Program. This course is for high school students who are interested in a first year university level course in European history. The course surveys European history from between 1450 ...
Causes of World War I. European diplomatic alignments shortly before the war. The Ottomans joined the Central Powers shortly after the war started, with Bulgaria joining the following year. Italy remained neutral in 1914 and joined the Allies in 1915. Map of the world with the participants in World War I c. 1917.