Misc: Who is the patron saint of mountain?

Questions

Ratio of the mass of a body to its volume, usually expressed as its specific gravity?

Rehaven, elberta, desert gold & sunhaven are all varieties of _____?

Rene descartes & Pierre de Fermat are credited with significant development of _______ theory?

Republic in south eastern Africa, formerly the British protectorate of Nyasaland, bounded on the north by Tanzania, on the east by Lake Nyasa (malawi), on the southeast & south by Mozambique, & on the west by Zambia?

Republic in south western Asia, located on the eastern shore of the Mediterranean Sea?