Basically physical and chemical weathering (do not confuse with erosion, which involves movement) contribute to the destruction of mineral forms. In this case it breaks down the rocks, minerals and soils, creating slopes and hills. It may be caused by (any form of) water, wind, gravity, waves or sunlight.
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South Asia is the birthplace of four of the world's religions: Hinduism, Buddhism, Sikhism, and Jainism. Three that come from West Asia: Christianity, Islam, and Judaism arrived later. Zoroastrianism, the major religion in ancient Persia (now Iran) until it became Muslim, also survives in India