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The first eon in Earth's history, the Hadean, begins with 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 Earth's crust and Earth itself.
World War II [b] or the Second World War (1 September 1939 – 2 September 1945) was a global conflict between two coalitions: the Allies and the Axis powers. Nearly all of the world's countries participated, with many nations mobilising all resources in pursuit of total war .
The causes of World War II have been given considerable attention by historians. The immediate precipitating event was the invasion of Poland by Nazi Germany on September 1, 1939, and the subsequent declarations of war on Germany made by Britain and France, but many other prior events have been suggested as ultimate causes.
So to understand how we came to exist on planet Earth, we'll need to know how Earth managed to stay fit for life for billions of years. Earth has been habitable for billions of years ...
World War II, with heavy bombardment, genocide, and explosions. Towards the end of the war, nuclear warfare occurs for the first and only time when Hiroshima and Nagasaki are bombed. post-1945: Nuclear tests are performed by the United States, Soviet Union, India, Pakistan, China, North Korea, the United Kingdom, and France.
Arthur Holmes proposed the more plausible mechanism of mantle convection, [16] which, together with evidence provided by the mapping of the ocean floor following the Second World War, led to the development and acceptance of the theory of plate tectonics. This theory provides the widely-accepted explanation for the existence and breakup of Pangaea.
The Pacific War, sometimes called the Asia–Pacific War or the Pacific Theater, [36] was the theater of World War II fought between the Empire of Japan and the Allies in East and South East Asia, the Pacific and Indian Oceans, and Oceania.
The aftermath of World War II saw the rise of two global superpowers, the United States (U.S.) and the Soviet Union (USSR). The aftermath of World War II was also defined by the rising threat of nuclear warfare, the creation and implementation of the United Nations as an intergovernmental organization, and the decolonization of Asia, Oceania, South America and Africa by European and East Asian ...