The Earth's revolution occurs in two different ways. The Earth revolves around the sun, and it also revolves, or rotates, on its own axis.Know More
The Earth revolves around the sun at a speed of about 67,100 miles per hour. One whole orbit or revolution around the sun takes approximately 365.25 days, which comes out to a year. The extra 0.25 day is accounted in the extra day on leap years every 4 years.
The Earth's axis is tilted slightly, meaning part of the planet is closer to the sun and part of it is farther away at any given time. The actual distance to the sun also changes throughout the year, from a high of 94,509,130 miles around July 4th to a low of 91,402,505 miles around January 3rd. Because the Earth tilts towards the Southern Hemisphere in January , it means that the Southern Hemisphere gets slightly more solar energy than the Northern Hemisphere over the whole year.
The Earth's rotation around the sun and its tilt also produce the seasonal variations in the weather. As the Northern Hemisphere tilts towards the sun, it experiences the warmer temperatures of summer. At the same time, the Southern Hemisphere is tilted away from the sun and experiences winter.Learn more about Earth Science
Mutations affect organisms in two different ways. Genetic mutations are inherited DNA changes that can be passed on to the next generation. Somatic mutations are DNA changes that are acquired after birth. Mutations can be helpful, harmful or make no difference at all.Full Answer >
Russian botanist Konstantin Mereschkowsky was the first person to discover the chloroplast. His discovery was the result of his work with lichens. In 1905, he began arguing for the symbiotic origin of the chloroplast and nucleus.Full Answer >
A constructive force creates or builds something on the earth. For instance, volcanoes are built up by constructive tectonic plate movement. Destructive forces like tornadoes and tsunamis tear down or wear away parts of the earth.Full Answer >
A mudflow (also called a mudslide) can change geographical areas, destroy homes and kill people. Mudslides are a subcategory of landslides and can happen anywhere at any time when earth, rock and other debris become saturated with water.Full Answer >