Evidence 1.
Atomic clocks, which have for the last 22 years measured the earth's spin rate to the nearest billionth of a second, have consistently found that the earth is slowing down at a rate of almost one second a year. If the earth were billions of years old, its initial spin rate would have been fantastically rapid--so rapid that major distortion in the shape of the earth would have occurred. a) Arthur Fisher, "The Riddle of the leap Second," Popular Science, Vol. 202, March, 1973, pp. 110-113, 164-166. b) Air Force Cambridge Research Laboratory, Earth Motions and Their Effect on Air Force Systems, November 1975, p. 6. c) Jack Fincher, "And Now, Atomic Clocks," Readers' Digest, Vol. III, November 1977, p. 34.
Response:
As explained on the Leapsecond page of the National Earth Orientation Service, the true spindown rate of the earth is 1.5 to 2 milliseconds per day per century. That means that after 100 years, the length of day has systematically increased (on average) 0.0015 to 0.002 seconds. This is also found, for instance, in Kurt Lambecks's book "The Earth's Variable Rotation" (Cambridge University Press, 1980; currently out of print), page 3. This is a long-term secular variation. As Lambeck and numerous others point out, there are variations on the length of day that range from daily to seasonal in scale, so that the true length of day can vary greatly from day to day, over multi-year time scales.
The author of this argument has failed to realize that one second as defind by the rotation of the earth is slightly longer than one second as defined by atomic clocks. So the earth-rotation time scale runs about 2 milliseconds per day behind the atomic clock scale (because the two use seconds that are not the same length). The leap second is a convenient device for keeping the two timescales always within 0.9 seconds of each other. It is not a result of the earth slowing down by one second per year.
Evidence 2.
Direct measurements of the earths magnetic field over the past 140 years show a steady and rapid decline in its strength. This decay pattern is consistent with the theoretical view that there is an electrical current inside the earth which produces the magnetic field. If this view is correct, then 25,000 years ago the electrical current would have been so vast that the earth's structure could not have survived the heat produced. This would imply that the earth could not be older than 25,000 years. a) Thomas G. Barnes, Origin and Destiny of the Earth's Magnetic Field (San Diego: Institute for Creation Research, 1973).
Response:
The argument in general is very weak. The argument as made by Barnes is directly false. I have already written an extensive critique of Barnes' work, which is found in the talk.origins archive. Barnes' argument is tightly circular and illogical, since it directly assumes the truth of the proposition to be proved. Barnes makes the simplistic mistake of extraplating an empirical fit to a 150 year data set over a 10,000 year range and claims the extrapolation is valid! Barnes wrongly insists that dynamo action is forbidden by Cowling's theorem, ignoring the fact that Cowling himself had already proven that this could not be true, 15 years before Barnes published his book! A very poor argument.
Evidence 3.
The atmosphere has less than 40,000 years worth of helium, based on just the production of helium from the decay of uranium and thorium. There is no known means by which large amounts of helium can escape from the atmosphere. The atmosphere appears to be young. a) Melvin A. Cook, Prehistory and Earth Models (London: Max Parrish, 1966), pp. 10-14.
Response:
Directly false. Current observation & measurement shows that the rate of helium loss from the atmosphere balances the rate of production through radioactive decay in the crust and mantle. Cook was unaware of the loss of ionized helium along polar magnetic field lines, as are more current champions of the same argument. A detailed response is available.
Evidence 4.
There have been no authenticated reports of the discovery of meteorites in sedimentary material. If the sediments, which have an average depth of 1½ miles, were laid down over hundreds of millions of years, any of these steadily falling meteorites should have been discovered. Therefore, the sediments appear to have been deposited rapidly; furthermore, since there have been no reports of meteorites beneath the sediments, they appear to have been deposited recently. a) Peter A. Steveson, "Meteoric Evidence or a Young Earth," Creation Research Quarterly, Vol. 12, June, 1975, pp. 23-25.
Response:
Directly false. Meteorites in fossilized sediments are rare, but they do exist. And meteoritic dust and debris are quite common in sediments. There are also a few hundred undeniable impact structures (i.e. craters) on the earth. A detailed response is available.
Evidence 5.
The rate at which meteoritic dust is accumulating on the earth is such that after 5 billion years, the equivalent of 182 feet of this dust should have accumulated. Because this dust is high in nickel, there should be an exceedingly large amount of nickel in the crustal rocks of the earth. No such concentration has been found--on land or in the oceans. Consequently, the earth appears to be young. a) Henry M. Morris, Scientific Creationism (San Diego: Creation-Life Publishers, 1974), pp. 151-153. b) Steveson, pp. 23-25. c) Hans Peterson, "Cosmic Spherules and Meteoritic Dust," Scientific American, Vol. 202, February, 1960, p. 132.
Evidence 6.
If the moon were billions of years old, it should have accumulated extensive layers of space dust--possibly a mile in thickness. Before instruments were placed on the moon, NASA was very concerned that our astronauts would sink into a sea of dust. This did not happen; there is very little space dust on the moon. Conclusion: the moon is young.
Response:
Since items 5 & 6 deal with essentially the same thing, that being the accumulation rate of interplanetary dust, on either the earth or the moon, I have taken them together. The short answer is that this argument is diirectly false. The accumulation rate of meteorite dust is now known by way of direct observation. That measured rate is inconsistent with the young-earth argument. Add to this the fact that the citation of Pettersson's work is not correct, and you get an argument that was already weak when it was originally generated, but now stands simply falsified. A more detailed response is available.
Evidence 7.
The sun acts as a giant vacuum cleaner which sweeps up about 100,000 tons of micrometeoriods per day. If the solar system were just 10,000 years old, no micrometeoriods should remain since there is no significant source of replenishment. A large disk shaped cloud of these particles is orbiting the sun. Conclusion: the solar system is less than 10,000 years old. Paul M. Steidl, The Earth, the Stars, and the Bible (Grand Rapids: Baker Book House, 1979), pp. 60-61.
Response:
Directly false. While it is true that the dynamic lifetime of dust in the solar system is short compared to the age of the solar system, the statement that there is no significant source of replenishment is known to be false. A detailed response is available.