Answer:
When looking north, you see stars appear to move in circles.
Explanation:
- The motion of stars in northern hemisphere shows the circular motion that follows the path around the Polaris.
- As it takes 24 hours to complete one full circle, so during a night less than 12 hour, we see only certain part of path i.e. stars moving in an arc.
- And if you're facing north, they are moving from west to east.
- So depending upon the time of observation the stars may take the path of an arc or the full circle.
Answer:
Explanation:
Sustainability could simply be defined as the reasonable maintainance at present to prevent compromising the availability of such resources in the future. Sustainable development has become a popular term in our changing environment today especially as the need for energy as soared and the need to mitigate and adapt to the use of more climate friendly resources has become increasingly important. We need to tailor our needs and wants in such a way that it does not jeopardize the environment the future generations will live in. Changes in climate and weather patterns is on the horizon largely due to continued emission of green house gases (mostly carbon) into the atmosphere, these emissions will most likely increase as the energy demands have risen largely due to population growth. Without sustainable development strategies, the environment runs the risk of being challenged by food security, water level changes all due to changes in climatic condition triggered largely by human activities.
Answer:
None
Explanation:
The Antarctic Circle, unlike the Arctic Circle, does not officially pass through any country. This is due in part to the lack of land masses at extreme southern latitudes, but also because no country can lay claim to Antarctic per the terms of the Antarctic Treaty.
On the Antarctic continent, the polar circle passes through territory claimed by France, Chile, Great Britain, Argentina and Australia, but none of these are official or recognized claims.
Answer:
Density is one of the most factors that play a key role in plate tectonic activities. Some of the ways in which density is important in the field of plate tectonics are as follows-
- The convergent plate boundaries are responsible for the creation of a subduction zone, where the high-density lithospheric plate subducts below the less dense one. It is because the heavier plate is comprised of heavy minerals thereby forming heavier rocks as a result of which its density increases. Due to these differences in density, there occurs a subduction zone.
- The divergent plate boundary forms where two plates move away from one another. This type of plate motion is responsible for the eruption of magma on the seafloor. As the plates diverge, the lithosphere becomes eventually thin, and with more progressive spreading, the magma comes out to the seafloor. This is because the hot magma is less dense, and forms convection cells as they rise upward. This is how the density helps in the upwelling of magma at the mid-oceanic ridge in a divergent plate boundary.
- When there collide two plates of equal densities, then it gives rise to the formation of huge mountains, because neither of them is heavy to get sink. So it uplifts the crust, forming a sandwich-type pattern.
Water is needed to irrigate crops; for drinking, sanitation, and transportation; and also to produce electricity. Many countries in this region are located along swiftly moving rivers. They are able to harness this water to generate electricity. Rivers running down mountains are dammed to produce hydroelectric power.
