Answer:
a circle on the surface of a sphere which lies in a plane passing through the sphere's centre. As it represents the shortest distance between any two points on a sphere, a great circle of the earth is the preferred route taken by a ship or aircraft.
The major environmental concerns in Oceania and Australia re the overfishing and the invasive species.
Explanation:
Australia and Oceania, as pretty much every place in the world, have some big environmental problems. Unlike the rest of the world, this region doesn't really have problem with deforestation, but it has big problems with overfishing, as well as with invasive species. The overfishing and the invasive species combined, manage to create huge problems, especially when it comes to the protection of the native species and keeping their numbers stable.
The overfishing has occurred because of the higher demand for fish. It is not just the local population that uses the fish extensively in its diet, but also there is huge demand worldwide, so lot of fish is actually for export. This has resulted in badly damaging the fish populations, and bringing some species on the verge of existence. The invasive species, have been brought in order to solve some problems, especially when it comes to food supply for the humans, but it turned out that they are fatal toward the local flora and fauna. Species like the cat, fox, camel, pigs, have managed to outcompete the indigenous fauna and lead to its endangering.
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Showing how trends change over time
Formation. Our solar system formed about 4.5 billion years ago from a dense cloud of interstellar gas and dust. The cloud collapsed, possibly due to the shockwave of a nearby exploding star, called a supernova. When this dust cloud collapsed, it formed a solar nebula—a spinning, swirling disk of material. Approximately 4.6 billion years ago, the solar system was a cloud of dust and gas known as a solar nebula. Gravity collapsed the material in on itself as it began to spin, forming the sun in the center of the nebula. With the rise of the sun, the remaining material began to clump together. Part of Hall of the Universe. The Sun and the planets formed together, 4.6 billion years ago, from a cloud of gas and dust called the solar nebula. A shock wave from a nearby supernova explosion probably initiated the collapse of the solar nebula. ... In a similar manner, moons formed orbiting the gas giant planets. Hope this helps!
