and (the amount of salts dissolved in the water) affect the of the water. Changes in density caused by and at the surface affects the deep-ocean currents. Density ultimately affects the , such as whales, seaweed, and submarines; however, the density also matters because it .

muslims have taken his goods and products to different parts of asia an indonesia. sometimes just traveled and trade, but in other occasions, stayed in the place and made a living.

trade was the key for muslims economies to prosper. their commerce routes reached far places like malaysia and java in the 11th century.

another important factor for prosperity was that muslim states served as the middle point for european traders.

they used to travel by land but sailing the seas -the indian ocean- really increase the exportation of products.

the use of electrical signals that transit messages is know as

answer; higher rate;