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The density is between 4.3g/cm³ and 5.4g/cm³.
The formation process of these stones under high pressure and temperature allows very little open pore space. However, the quartz grains contract more than half their volume during the cooling process, and extensive cracking develops across and around the quartz grains. The grain size of granite and granite-type stones range from small to large and a particular variety may be composed of two grain sizes, this increases its porosity. It can be said that granite has more of a fracture system than a pore system.
Let's not forget that the bulk of the volume of the Earth is mantle and not crust. Pressures are high. There are no pore spaces. The density of mantle rocks is much higher than either basalt or granite.
You really should do some research before you post comments that are easily proven wrong.
Granite is porous.
Exactly, which is why escaping mantle expands in volume on the surface when it transforms to basalt and granite, and the many other types of rocks, and other materials that escape from the mantle.
There are no concrete numbers on how much material falls into the Earth's gravity well from space, but lets go with your 26g per square kilometer. Multiply that by a million years, and you have 26,000 kilograms of material, which gives you 26kgs per square meter, or 57 lbs of dirt. That is quite a bit of dirt. Think of a 20lb bag of dirt. You are looking at about 6 inches of powder. Then multiply that by 20, for 20 million years. 1,140 pounds of dirt per square meter. In a hundred million years, 5,700 pounds of dirt per sq meter.
The question isn't whether or not the Earth is growing, undoubtedly it is, the question is, at what rate.
Looking at the picture with the age of the ocean floor, my rough guess is that Earth has grown about 30-40% in the last 30 million years. Nothing else explains why the floor of the Ocean is so new.
So you pick the rock with the smallest possible pore space.
Note that, as the continents are pushed around the planet under pressure of an ever-widening Atlantic Ocean, a fixed, unchanging diameter would result in subduction eventually swallowing the entire Pacific Ocean basin—IN SPITE OF continuous propagation of new ocean seafloor at the rate of ~80-160 mm/yr (~3-1/4 to ~6-1/2 in/yr) along the hyperactive East Pacific Rise (EPR) west of South America (the most active volcanic area on the planet) right in the middle of the supposed subduction area. (This is also a volatile heat source directly beneath the area where El Niños are spawned by heated Pacific waters.)
Further evidence of expansion is provided by the +65.3 mm/yr rate of increasing width in the trans-Pacific distance between Yaragadee, Australia, and Arequipa, Peru, measured by Smith, et al [1993]. This study, and others like it, was published as evidence of subduction, but the addition of width contradicts the principle of Pacific basin width reduction required by subduction on a fixed-diameter Earth; e.g., any increase in width is an increase in surface area of the Pacific basin and Earth's total surface area, circumference, and diameter-- with or without subduction.
External accretion of extraterrestrial mass is irrefutable. Everyone knows about meteors and meteor showers that regularly enhance the night skies at certain times each year. Meteorites, the solid remnants of meteors that land on Earth, are also known to almost everyone, even though few may have actually seen one.
Equally important, the more fundamental causative mechanism of gravitational pressure on the core that generates heat to melt core magma must be considered. For that, scientists must look at the much larger, and far more complex, process of gravitationally-driven compressive heating that melts the central core. This is the process that powers expansion tectonics--continuous and inexorable expansion of the planet--as an inevitable and unavoidable consequence of the Earth increasing in mass and diameter from incessant accretion of ~1,000-50,000 tons of meteor dust and meteorites every day. (Perhaps NASA can refine these estimates using their experiences after three decades in space.)
As the Earth accretes material from space....
5.972 sextillion (1,000 trillion) metric tons. That's 5,972,000,000,000,000,000,000 tons.
ecology.com...
Originally posted by poet1b
reply to post by stereologist
So you pick the rock with the smallest possible pore space.
Still makes it porous.
The final result of mantle to rock is expansion. Of course there is contraction when it cools, but the end result is still not as dense as the beginning, and so there is expansion.
Do you have any evidence to back up your claims.
... the band wagon of the expanding Earth movement left long ago.
The Earth is only 4.5 billion years old.
There is plenty of evidence of large meteor strikes.
Looking through the layers of the Earths surface, the amount of material accreted can be seen.
Originally posted by weedwhacker
reply to post by smurfy
40 wimpy tons? Even per day (if accurate) is 14,600 tons/year.
Let's further (just for fun) assume it is constant at that rate. Just using about 100,000 years for the existences of "modern" Humans = 1,460,000,000 tons over that time-span. Theoretically....
Total "weight" of the planet?
5.972 sextillion (1,000 trillion) metric tons. That's 5,972,000,000,000,000,000,000 tons.
ecology.com...
Let's find that 100K years accumulation as a percentage of the total Earth mass: We can drop two sets of three zeroes from each figure, and still get the same result:
1,460 divided by 5,972,000,000,000,000 = 2.4447 X 10 (exp)-13 % That would be the added "weight" (or, more correctly, mass) for those 100,000 years, at that "constant" rate.
So, to write that out, we move that decimal point thirteen spaces to the left....:
0.00000000000024447 %
That is rather TINY number, in percentage, I would tend to argue. And covers more than the course of recorded Human history....(I don't recall seeing where we had writing invented yet, 100,000 years ago)....
(Thanks to our handy decimal system of numbers, you can adjust basic % figure by factors of 10, if you wish to count into the millions and billions of years......).
edit on 11 March 2011 by weedwhacker because: (no reason given)
Th expanding Earth isn't exactly a completely worked out theory, but it does make a lot more sense than the idea of one crustal plate being forced down under another, piercing into the much more dense mantle.
If Plate Tectonics theory is so complete, please explain this problem. How is the Pacific ocean being shrunk, when all evidence points to the Pacific Ocean expanding?
The theory still needs development, but already it is more complete than the concept of tectonic plate drift.