1.why is the earth not perfectly round? 2.what are some of the more common element composing the earth? 3.what cause the interior of the earth to be hot and how hot is it? 4.what is covection?what are some other example of convection beside hot soup?5.what is the relation between rising and sinking material in the earth's interior and subduction and riping?6.when it is summer in Autralia , what season is it in new york? it is april in Paris7.what is a precession?what are some of its possible consequence.8.what is the mid-atlantic ridge? 9.would a year on the planet neptune be longer or shorter than on earth year?
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1) the earth is not perfectly round because it rotatesThe rotation of the earth adds centrifugal effects, which cause the earth to bulge slightly at its equator and flatten slightly at its poles2) The top ten most common elements in the crust are; Oxygen 46.1% , Silicon 28.2%, Aluminum 8.23%, Iron 5.63%, Calcium 4.15%, Sodium 2.36%, Magnesium 2.33% Potassium 2.09%, Titanium 0.565%, Hydrogen 0.14%3) heat of the Earth's core is a mixture of two sourcesThe first is the initial heat from the formation of the planet.The second source is the (continuing) decay of radioactive elements in the bulk of the Earth (mantle as well as the core)4) Convection in the most general terms refers to the movement of currents within fluidsConvection within Earth's mantle is the driving force for plate tectonics5) As ocean plate is subducted it is heated by the mantle and this partial melt is more bouyant, rising towards the surfaceThis is the process that creates subduction volcanoes like the Cascades and the Andes6) The season in the northern hemisphere is always opposite the season in the southern hemisphere7) Precession refers to a change in the direction of the axis of a rotating object8) The mid atlantic ridge is an underwater volcanic mountain range created by two oceanic plates seperating and allowing magma to rise and fill the void, creating new crust9) Neptune takes 165 years to complete one orbit around the Sun.
