The Earth has been around for approximately 4.6 billions of years. Humans first evolved from I believe apes around 5 million years ago, with Homo Sapiens evolving around 2 million years ago or so. The current calendar system we use today, the Gregorian system (in most western nations like America) marks the year 0 as the year Jesus Christ was born, not when the Earth was formed. Years before Jesus' birth are marked as B.C., with the numbers getting higher the earlier you go. In the Japanese system, the year is marked by how long the current Emperor has been in power, making the current year (2017) Heisei 29 in traditional Japanese calendars.
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Earth magnetic field results from movement in the -----
Earth magnetic field results from movement in the outer core. Due to the huge heat pressure of the inner core, this results the outer core to melt. Outer core's movement is the reason of the existence of Earth's magnetic field.
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Answer:
Australia: Willem Janszoon and James Cook were explorers of Australia.
New Zealand: Abel Tasman and James Cook explored New Zealand.
Antarctica: Fabian Gottlieb von Bellingshausen, Roald Amundsen and Henryk Bull explored Antarctica.
A line segment is precisely defined using the undefined terms point and plane. These three terms are undefined terms in geometry. A point has no dimension. A plane has no thickness but extends at all directions. A line has no thickness but extends in one dimension.
In Geometry, we define a point as a location and no size. A line is defined as something that extends infinitely in either direction but has no width and is one dimensional while a plane extends infinitely in two dimensions. There are three undefined terms in geometry. And the third undefined term is the line.
Answer:
Unless the land it totally flat, rivers of water run downhill. ... If the source of a river is at a higher elevation than the mouth, that river will run from the source to the mouth. However, if that (higher) source is to the south of the mouth, that river will then flow to the north (downhill).