September 24, 2019

American Museum Of Natural History Paper

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The Earth formed when the sun and its forming of planets formed when a cloud of dust and gas condensed 4.6 billion years ago. In large areas, iron sinks to the center forming the core. The Mantle is made up from primarily of the minerals olivine and pyroxene. It takes up 80% of the planet. The oceanic crust typically differ from continental crust because Earth's surfaces cooled below 100 degrees C. Water rained out of the atmosphere. Continental Crust is very thicker then the oceanic crust. The oldest rock that was found on Earth was the Acasta Gneiss from the Canadian Shield. Quartz pebble formedbillion years ago but the zicron crystals are 4.76 billion years old. It undergoes uplift, erosion, and growth. The age of the earth was being solved in many different ways. In the 1700's they believed on the age by parts written in the bible, to getting seashells and fossils. In the 1800's for using studies of rocks to estimated


Ice Core aremeters in lengths to form a core that penetrated through the entire 0 meter thick Greenland Ice Sheet. Left core sample depth is 708 meters in 88,670 B.C. Middle core sample depth is 168 meters in 10,075 B.C. The right core depth is 15.5 meters in 5,671 B.C. Solar radiation warms the Earths surface. Some of the hear radiated back to the atmosphere. It is trapped by greenhouse gases, without it, the Earth's average temperature would be below freezing. With it planet is warm to support life. Earth's temperature is changed because of the rotation of the planet and the rotation of the storms which can follow the planet and the areas of different climates. That climate changed effect through out when the Earth rotates. In the carbon cycle of the planet some fossil fuels releases some points of CO. When humans populate the area more and more CO go into the air increasing the use of fossil fuels.


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There were two theories that scientist said began early life. Most likely life began by hydrothermal vents or the possible theory that life began from a meteoroid hydrocarbon bubble. There were many rocks which contained old fossils. Fossil fish were used to be in the Knightia which was an extinct river. The compositions of the atmosphere over time was that the oxygen which is now Earth's atmosphere was not there in the beginning. Early life began when the sun was releasing energies into foods. The Jasper iron reminded that life was breathable back then. Even though the sun was 5% less bright then today the earth was young and the core was bigger making it colder then it is today even though the sun was less bright. For the pastmillion years the climate of our planet has been mostly cold, with great ice caps covering most of the continents. Temperatures were 5 to 15 degrees C colder then today. The glacier periods were interrupted by the warm periods which makes up about 10% of the last million years.


On Earth there were many geological history and the most greatest in America was the Grand Canyon and what process brought about its formation. Themajor type if rocks in the Grand Canyon were Tapeats Sandstone which are the first sedimentary layer deposit about 550 million years ago. Red wall limestones for 00 million years after deposition of the tapeats. Coconino Sandstone formed 80 million years later. The oldest known rock on the Grand Canyon is the Tapeats Sandstone which is 550 million years old and the youngest known rock is the Kaibab Limestone which is 60 million years old. The ancient evens stated that it was caused by the extensive uplift and erosion to raise the rocks higher. It is mainly formed when climates changes over time. The Tapeats Sandstones is 550 Million years old. It was the first sedimentary layer deposited along the beach of and ancient shoreline. The shviwits plateau just to the north of the Grand Canyon contained gravels deposited by rivers. Soon after the deposit the gravels were covered by lava dated 6 million years old. The canyon was formed by uplift and erosion.


Also in events many volcanoes were formed and there were considered to betypes of volcanoes, explosive volcanoes and effusive volcanoes. When the effusive volcanoes erupts effusively it forms flows. Most basaltic lava erupts and forms more flows and most of these volcanoes erupt usually on ocean floor. Effusive volcanoes formed the Mid-Atlantic ridge when the magma exploded in between the ocean, it separates the direction of plates to go opposite ways. Basaltic lava mostly erupts on the ocean floor and under/along the sea or the mountain chains. Intrusive rocks formed by molten magma, Igneous rocks are when magma cools down. Explosive is caused when the magma is very hot it causes and lifts above and explodes making the magma to flow out our of the volcanic structure and cools down quickly when it reaches the outside surface. Explosive volcanoes occurs on the surface in the continents forming from the ground up whenplates collides together and it rises above surface. Igneous rock is telling us that the temperature of the lava cool down quickly. Metamorphic rock is which rock changes entirely due to the volcanic eruption and sedimentary rock forming after the magma is dried.


Overall in conclusion these were possibly the major effects upon our planet and how climate and life evolved. How Earth's possible age was calculated and how people went far and beyond to determine the Earth's age and other scientific questions which we now know today.


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