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Continental drift geography
Modern earth science section 4.1 continental drift
Introduction to continental drift and plate tectonics
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So many meteorites hit the Earth, but there aren’t very many craters to prove it. This is because, not only are most meteorites that reach Earth very small, but the Earth’s surface is always changing. Many meteoroids enter Earth’s atmosphere every day but most of them are only a few milligrams in size. Only the largest ones reach Earth’s surface as meteorites. “The average meteoroid enters the atmosphere at between 10 and 70 km/sec” (Meteors, Meteorites, and Impacts). The really big ones aren’t slowed very much, and these are the ones that make craters, but they are very rare. Very few of the meteorites that hit Earth are actually discovered and made known to scientists, as well as craters. Not very many impact craters are found on Earth partially because about 70% of the surface is water but also because of plate tectonics and continental drift. Plate tectonics and continental drift states that plates are gliding over the mantle and the Earth’s crust is being …show more content…
“recycled”, gradually changing the appearance of Earth’s crust. This would mean that some of the impact craters have disappeared and are hidden by oceans as well. Also, most rocks found on Earth are younger than meteorites and that is because of plate tectonics “recycling” the rock. The reasoning for lack of impact craters is due to mostly the ocean and plate tectonics. The surface of the Earth has changed dramatically since its original formation.
Meteorites, having a decent impact on this, have been separated into three categories; stony, stony iron, and iron. They have been split into these because of their composition and stony is the most commonly found on Earth. This suggests that other objects in the universe are made of some of the same material because meteorites are usually small pieces or leftovers of a larger object in the solar system. Planetary surfaces are the surfaces that show the impact cratering but less impact craters are found than the number of meteorites. The age and histories of different planetary surfaces can be determined by impact craters. “Scientists record the size and number of impact craters - and how eroded they are - to determine the ages and histories of different planetary surfaces” (Impact Cratering). Even though so many meteorites hit Earth, a lot of impact craters are difficult to recognize because Earth’s weathering and
erosion. Overall, the early history of the Earth and the birth of the solar system is highly supported by the scarcity of impact craters, the development of Earth’s surface, and the formation of the solar system. Through radiometric dating and ages of the oldest meteorites, the Earth is thought to be 4.6 billion years old.
Brian Doyle’s, “The Meteorites” was a short essay about a camp counselor and his unforgettable summer. Doyle uses very poignant arguments to explain his love for his campers. Each camper is introduced with a short synopsis, allowing the reader to get a feeling for what the children are like. The counselor was in charge of a flock of 5-6 year olds. The second paragraph introduces the main argument: how this summer camp made him love the boys as if they were his own. The paragraph goes continues the counselor is pulled aside by one of the shyest and quietest that was speaking up for the most outspoken of the group. He was asking for help because one David (outspoken on) had an accident in his pants and needed to be clean. This puzzled the
Ultimately the development of previous inferences and observations which have developed our current model for the Earth’s composition and interior structure are a key concept in understanding our future developments towards resourcing our planet and understanding how it works to a further degree.
However, asteroids are much more deadly. If over-sized meteor can wreck buildings and injure people, then a normal sized asteroid can easily wipe out species if it lands in the right place. As mentioned before, asteroids are much bigger than meteor and much more rare. According to the “Mail Online” 12,000 years ago some type of asteroid slammed into the Northern Canada and some scientist believe that wiped off the mammoths and caused the “Younger Dryas”. Another famous event of asteroids striking, that many scientist believe, was around 65 million years ago asteroids rained and killed of all the dinosaurs 75% of all the life on earth.
Most meteors burn up when they enter Earth’s atmosphere. There are a few meteors however, that make it to the surface. The ones that make it to the ground are called meteorites.
regions of the earth can indicate which rock layer is older than the other. Trilobite fossils
Meteors are very common throughout outer space. They are being whipped around our solar system in every orbit possible. Normally they are peacefully and serenely floating through space, but one just has to look at the cratered face of our moon or Jupiter's moon Callisto to see that more than a few meteor's journeys through space have been interrupted. The earth has been hit before and will be hit in the future, statistics show this. We must detect the meteors a long time before they cross paths with Earth to prevent an impact. The likelihood of a significant meteor impact in the near future is extremely small, but it is still a possibility.
Sixty-Five million years ago, 70 percent of life on Earth died. The most reasonable and possible reason this happened was an asteroid. An asteroid hit the Earth very hard, and in doing this, dirt and dust from the impact stayed in the air and it blocked out sunlight, that’s why the dinosaurs died. An asteroid is a rock from outer space. Asteroids have orbited the Sun along with the planets since the solar system formed about 4.6 billion years ago, but it’s only been 200 years since we first discovered them. Meteorites are small pieces of asteroids broken off on impact with other asteroids. Most meteorites are rusty brown on the outside, have rounded edges from melting as they go through Earth’s atmosphere, and contain iron. There are 3 different types of meteorites: stony, metallic, and stony metallic.92 percents of all asteroids are stone, 6 percent are made of iron and nickel, and the rest are a combination. Some meteorites also contain gold, copper, platinum, and carbon.
B. Meteroites are the particles of the a meteor that can lands on earth. They can be found in various sizes ranging from the size of a grain of sand to the size of a boulder. These meteorites are said be trillions of years old, and it quite possible some can be older than earth itself.
He would rush home to tell his wife about his findings. Jasmine believes his without a doubt. The couple was dumbfounded at how they were going to solve this problem. Michael and Jasmine would begin scouring the Internet to find out what would be the most effective way to get rid of the meteor. After hours of in depth research, they both would find that the best way to get rid of the meteor would be to blow it up. Now the couple would have to find a way to construct it. After all this they would find that a rocket would be the best way to destroy the meteor. They need to find an organization to help them construct the rocket.
For a long time, scientists have been wondering exactly what was on the surface of comets. They had not really been able to get up close to the surface of the comets and therefore gathered their information based on observations through various telescopes; that comets were just simply circular balls made of dirty looking ice. However, with the Rosetta/Philae mission, this all changed.
One of the areas I could identify during this observation was the Tycho. This was a interesting feature which looks like fireworks. Tycho is smaller than Copernicus and it is also relatively young in lunar terms, 108 years old. A dark ring surrounds Tycho which according to different studies, including one that landed on the crater, indicate the dark material is glassy impact-melted rock, scientist belief that a meteorite fell and during the impact and explosion occurred forming the crater.
The theory of the large impact hypothesis does correspond to reality and it does predict observations. What has long been believed about the origin of the moon seems to be what happened
Earth and the Moon have very different surfaces. Earth’s surface changes constantly. Movement of crust, erosion by water and wind, and living organisms all contribute to the changes. Plate tectonics cause the crust of Earth to move around and create mountains and volcanoes. The movement of water can cause re-shaping, and so can the wind when it picks up loose material, they both carve into the Earth. Living organisms change the surface a lot. They build, move and destroy things all the time. The Moon’s surface is mostly still. It doesn’t have a molten core, so there is very little tectonic activity. There is no wind, and the small amount of water is buried in polar areas. There are no living organisms to change the surface either. The only major factor in the Moon changing, is the impact of meteoroids. They form craters when they hit the surface. Lastly, Earth’s surface is very young, because it is changing constantly. The Moon’s surface is hundreds of million to billion of years old.
Scientists can tell how old something is based on the amount of carbon 14 in a dead object. Carbon dating is accurate if the amount of carbon 14 in the atmosphere remains the same throughout time. The second is if carbon 14 has always decayed at the same speed, and the last is if all living things absorb the same amount of carbon as the atmosphere has in it ("Child Evangelism of Hawaii"). Diamonds are formed when carbon is under a large amount of pressure and heat. When diamonds come from the ground, they don't look shiny.
Their history, changes and all other things related to them. Had it not been analytical chemistry, this field would not have progressed as it has to the present day. The methods and techniques of the analytical chemistry help us to determine the kind of substances that make up the earth and the number or amount in which they are present. There are different types of minerals and ores. All of them have different commercial values in accordance with the metals they are made up of. So, the quantity and quality of a particular metal in an ore must be analyzed by proper methods. Different types of rocks present on the earth are identified by different methods in the field as well as in the laboratories (called petrology). Optical microscopy and electron microrprobe are the two main methods that are used to analyze rocks in the