That is false, all muslims that can financially make the pilgrimage to the holy site of Mecca are required. The holy pilgrimage to Mecca, also called Hajj, is one of the 5 pillars of Islam.
Plate tectonics are important to geoloigists because they explain how the continents make up the earths crust.
Answer:
yes the asthenosphere can break
Answer: If the sin 30° = 0.5, then the cos 60° = 0.5 (same as 1/2)