Ocean currents can be generated by wind, density differences in water masses caused by temperature and salinity variations, gravity, and events such as earthquakes. Currents are cohesive streams of seawater that circulate through the ocean. Some are short-lived and small, while others are vast flows that take centuries to complete a circuit of the globe.
Answer by Hyllary. Confidence votes 247. Rawhide is made from the skin of animals, usually cow. The skin is split into inner and outer layers. The tough outer layer is used for leather shoes, garments, and upholstery, while the softer inner layer is cut and formed into different shapes for dog chews.ones are made from calcium. A typical bone has an outer layer of hard or compact bone, which is very strong, dense and tough. Inside this is a layer of spongy bone, which is â¦ like honeycomb, lighter and slightly flexible.
Animals can have internal or external skeletons-while some do not have a skeleton at all. Insects have an external skeleton made of chitin. Sharks have an internal skeleton made of cartilage, and humans have an internal skeleton made of cartilage and bone. Hinge joints and ball and socket joints are synovial joints.The biceps and triceps muscles act as an antagonistic pair to move the arm at the elbow.nsects have an external skeleton made of chitin. Sharks have an internal skeleton made of cartilage, and humans have an internal skeleton made of cartilage and bone. Hinge joints and ball and socket joints are synovial joints. The biceps and triceps muscles act as an antagonistic pair to move the arm at the elbow.