Biology

Biology, 27.06.2019 06:00, latoyatuggle23

What element makes up most of earth’s crust?

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Physics, 10.09.2019 20:30, kobz

The surface area of the earth's crust is 5.10*10^8km^2. the average thickness of the earth's crust is 35km. the mean density of the earth's crust is 2.8g/cm^3. the most abundant element in the earth's crust is oxygen with an abundance of 4.55*10^3g/t. calculate the total volume of the earth's crust.

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Geography, 13.09.2019 05:30, shaydog6353

Which of the following is true of oceanic crust? a) it makes up 71% of the earth's crust. b) it makes up 29% of the earth's crust. c) it averages 2,000 feet above sea level. d) it is the type of crust between alaska and siberia.

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Biology, 18.09.2019 01:00, iamasia06

Sanjay is learning about the elements that make up earth’s crust. ms. richards, his earth science teacher, gives him an element and asks him to determine which element from earth’s crust it is. she also provides sanjay with this table. sanjay weighs the element and finds that it has a mass of 17.98 g. by placing the element in water, he determines the volume of the substance to be 2.2835 ml. based on the table from ms. richards, what element from earth’s crust did ms. richards gave to sanjay?

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Chemistry, 16.10.2019 23:10, benwill0702

1. (20 pts) amount of your element: assume the earth is a sphere with a radius of 6,400km and the crust is 25km thick. a. (5 pts) explain the distinction between reserves and the resource base. b. (5 pts) for your element (final project or pick one if you do not have one yet) calculate how much we have in the earths crust. ignore the oceans as a source of your element (even if it is a source) c. (10 pts) for your element. a company wants to mine this element from a near earth object. cost per kg to put an object in space on an atlas v rocket is $27,000/kg. assume that the weigh of equipment that must be landed on the near earth object is 2,000kg. if the abundance of the element is twice that on earth, how many kg need to be on the near earth object to hit the break-even point? (assume all equation shown in lecture on earth apply to space mining.)

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