The position of a place north or south of the equator is described
in terms of its latitude. Since we're talking about the surface of
a sphere, latitude is an angle, and its value is given in angle
measure.
Any unit of angle is fine ... degrees, radians, grads, etc., and if
you're given an angle in one unit, you can always easily change
it to a unit that you like better ... but 'degrees' has been the unit
used most often for latitude, and longitude too, practically since
the whole system was invented a few hundred years ago.
For parts of an angle smaller than a whole degree, 1/60 of a
degree (minutes) and 1/3600 of a degree (seconds) were used
traditionally for the first couple hundred years. But that ponderous,
inconvenient system is rapidly giving way now to plain old decimal
degrees, probably because those are easier for the computer to handle.
It is topography that is formed from the dissolution of soluble rocks such as limestone.
Subsoil: This layer has normally less organic matter than the A horizon, so its colour is mainly derived from iron oxides. Iron oxides and clay minerals accumulate as a result of weathering. In a soil, where substances move down from the topsoil, this is the layer, where they accumulate.
Note: This information has been taken out of a website.
Explanation:
In the planet Earth , there are movement like the plate tectonics , which makes the surface of earth crust to move continuously , which is capable to generate lines of individual islands and volcanoes .
But these type of tectonic movements are not possible in Venus or Mars .
Thereby making the surface of earth different from that of planet Mars and Venus .
