Conventional Signs. The common symbols including letters that are used for representing various relief and cultural features are called conventional signs.
Kinds of Conventional Signs. These are two types :
(i) Natural signs
(ii) Cultural signs.
(i) Natural signs : These signs are used for depicting the physical features of the earth's surface such as relief, vegetation and drainage etc.
(ii) Cultural signs : These signs are meant for showing man-made things on the map, such as railways, roads and human settlement etc.
it is because, igneous and metamorphic form at temperatures and pressures which destroy the fossil remains. dead organisms may become sediments which may, under right conditions, become sedimentary rocks
Air Mass is a volume of air characterized by temperature and water vapor content and stretched for 100 kilometers.
Classified according to the latitude and the source regions, like cold air mass found in cooler polar regions and warm masses form over the hotter and drier regions of continents and maritime air mass are found at the seas and oceanic masses.
As air mass differs based on there densities they have humid and temperature conditions and can be modified in various ways, an increase or decrease of temperature is also affected by the large scale environmental conditions.
because if the world has no tilt then the world is evenly heated so there would be no season's but since the world is tilted we have seasons so if it was tilted more then the seasons will be more extreme
