Your teacher is talking about spheres of the earth system. Spheres of influence which effect one another. She probably means earth ecology etc. The answer depends on her definition of the spheres of the earth. You need to know those three sphere definitions before you can answer the question.
<span>Planetary orbit system theories include heliocentric and geocentric theories. Heliocentric theory says the sun is the center of our solar system. Geocentric theory says the earth is the center of our solar system. One aspect of the scientific method is the necessity to suspend judgment in order to entertain the possibility of other answers. This helps us to reduce and minimize the effect of prejudice and emotion as we try to be as logical as possible in our fact gathering. Although we all see the sun rise and fall every day and it appears the earth is flat, it was not until we could suspend judgment and consider other possibilities that we could become more enlightened about the larger picture which includes other planets, the solar system, the galaxy, and the universe. Although it appears the sun orbits the earth, now we know that we orbit the sun. Waxing and waning of moons and planets provide clues to the sun as the center of our solar system and not the earth. </span>
<span>The moon was excised from the earth in a relatively gentle event involving a chain of meteors perforating our ancient equator. The moon then left the earth and succumbed to gravitational influence of the earth so that its one side always faces us as the earth revolves. There was very little angular momentum imparted to the moon when it was created so it left no debris field or ring around the earth and it "locked into phase" with the earth so it does not rotate relative to the earth. The gentleness of the moon's creation also explains why it has no iron from the earths core in it.</span>
Answer:
Modern irrigation systems, redirecting of streams or parts of them, and using drought resilient plants, will help gradually convert the desert and make it suitable for farming.
Explanation:
A lot of countries in the world have problems because a smaller or larger part of their territories is occupied by deserts, and on top of it, it seems like the deserts are expanding. The deserts as they are cannot really be used for anything, including farming, but this can be changed in managed properly.
In order to convert desert into land suitable for farming, a good and reliable irrigation system needs to be set up, at least for the first few decades. Ares that are relatively close and maybe have a surpluss of water, or it is a terrain where it cannot be used for farming or anything practical, the streams can be redirected toward the desert. This will bring in highly fertile sediments, a constant supply of water, and increasing humidity in the area. The plants that initially need to be used should be ones that are highly resilient to high temperatures and drought, but also leave a solid amount of biomass so that the soil can get a fertile top layer. Plants that can be very suitable are rosemary and succulents, and they will also be economically beneficial in the meantime while the transformation lasts as they can be easily sold on the market.
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By 1800, still over 90 percent of the global (and country-level) population lived in rural areas. Urbanization in the United States began to increase rapidly through the 19th century, reaching 40 percent by 1900. By 1950 this reached 64%, and nearly 80% by 2000.
