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The eastern and western hemispheres are separated by a single continuous line which passes through the geographical north and south poles. On the one side of the earth, it is the 0, or Greenwich, Meridian and, on the other (Pacific) side, it is the 180 meridian (which should not be confused with the International Date Line - though this approximates to the 180 meridian, it zig-zags across it repeatedly, at the behest of political convenience).
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Stevenothing really, it's just an imaginary line that determines what season it is because of the earths tilt. if it is summer in the northern hemisphere then it is winter on the other and the other way around.
There are, in fact, three lines, although only two are named. The named ones are the equator, the Greenwich Meridian. Then there is the unnamed longitude at 180 degrees: this is close to the International Date Line but not exactly the same since the IDL is not a true meridian.
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What lines act as a invisible grid over the earth?
They are the lines of latitude and longitude.
What are the five horizontal lines that divide the earth?
These are circles of latitude, rather than "lines".They are, in order from north pole to south pole:Arctic CircleTropic of CancerEquatorTropic of CapricornAntarctic Circle
On a topographic map where would you locate the contour interval in the margin?
It would be the difference between the two darker lines, or index lines, and then divide the space in between with your difference.
What is the purpose of dividing the earth into four hermispheres?
The Earth has been divided into four hemispheres, with lines of Latitude and Longitude in order to enable humans to navigate, reach and know where they were in the vastness of the oceans. Navigation was due mainly to a sextant (and a visible sun) and, eventually, an accurate ship's chronometer (clock). Nowadays, with GPS, and other modern devices, charts on paper are no longer vital, but very important if modern devices suddenly run out of power, or fail!
Why folding and faulting is one of the main causes behind earthquakes?
earthquakes often occur near fold mountains because fold mountains are formed on the earth's fault lines ( invisble lines in the earth's crust) and earthquakes happen when two fault lines crash together.
