The oceanic lithosphere consists of the upper part of the Earth's crust that is submerged beneath the oceans. It is primarily made up of basalt, but can consist of other forms of sediment deposited by rivers or currents; the basalt feature exists due to the oceanic lithosphere's creation via divergent tectonic activity. The continental shelf is a portion of the crust that is of higher elevation than the rest of the ocean due to its connection to the less dense continental lithosphere. The continental slope, therefore, is the portion of the crust where the continental shelf decreases in elevation as it meets the denser oceanic lithosphere. Abyssal plains are portions of the lithosphere far from spreading centers - they consist of rocks older than those near rifting centers. Due to the coolness of the plate and their distance from rifting centers, abyssal plains are some of the lowest continuous portions of the lithosphere (cool rock is denser and thus sinks to a lower elevation). Since they are very much inactive, abyssal plains are coated with sediment and are very, very flat.
Theory of Continental Drift
If you take a look at a map of the earth today, you will see the current locations of broken land masses that constitute the earth. However, would you believe if someone told you that these broken land masses were once connected to each other as one huge supercontinent? Well, this claim was made in the 90’s by Alfred Wegener, a German polar researcher, meteorologist and geophysicist who died in 1930.
Wegener’s theory of continental drift states that the existing continents of the earth were once glued together forming a super landmass. Over time, the landmass broke and drifted away and is still drifting to this day. In his proposal, he stated that the super content, which he named Pangaea, meaning ‘’all earth” once existed. The supercontinent was surrounded by water bodies, mainly oceans, and seas.
SAYS EARTHECLIPS
True. At a steeper gradient the velocity of the river is greater, combined with more discharge in the river the ability of the river to transport load increases as it has more energy.
Answer:
Global cultivated area on the planet is not increasing significantly, due to high efficiency modern farming practices - True
Henry Wallace is regarded as the father of the Green Revolution - False
Modern agriculture is no longer an environmentally intrusive human activity - False
Approximately 20% of U.S. workers are employed on farms. - False
Explanation:
Global cultivated area on the planet is not increasing significantly, due to high efficiency modern farming practices. - This is one of the reasons, albeit not the only one.
Henry Wallace is regarded as the father of the Green Revolution. - The father of Green Revolution is Dr. MS Swaminathan. He improved the production of crops and promoted sustainability.
Modern agriculture is no longer an environmentally intrusive human activity. - Pollutants, problems with irrigation and degradation of the soil are issues in the modern agriculture.
Approximately 20% of U.S. workers are employed on farms. - According to USDA is 11%.
Answer:
Antarctica
Explanation:
The largest glacier in the world is the Lambert-Fisher Glacier in Antarctica. At 400 kilometers (250 miles) long, and up to 100 kilometers (60 miles) wide, this ice stream alone drains about 8 percent of the Antarctic Ice Sheet. Antarctic ice is up to 4.7 kilometers (3 miles) thick in some areas.
