On what basis are sedimentary rocks identified? How can you distinguish a clastic fragmental sedimentary rock? How does a sedimentary rock become an igneous rock? How are fossils found in sedimentary rocks? How are fossils formed in sedimentary rocks?
The source rocks for the small shards have not yet been identified. (Image credit: John Valley, University of Wisconsin.) More than 70 meteorites that have fallen to Earth have had their ages calculated by radiometric dating. The oldest of these are between 4.4 billion and 4.5 billion years ...
This is an interesting and intimate questions. In my case it was thanks to my father. I told my parents, very young, each time walking the countryside or the beach, always came home with pockets full of stones, especially if they were brilliant (mainly quartz and opals polished by the se...
Acids are reactive, with even weak acids like vinegar interacting with other materials to wow students. But strong acids can really put on a show. For example, aqua regia, or royal water, is a mixture of two strong acids—hydrochloric and nitric acids - that can dissolve gold, anoble meta...
the U.S. outdoor recreation sector is growing more than one-and-a-half-times faster than the overall economy. Historic federal legislation passed earlier this year is opening more than a million acres of wildlands to public access. Increasingly, nonprofit groups andgovernment agenciesare harnessing...
there was very little penetration of wind and solar power there was optimism about cap and trade policies the pause was less than 10 years, and not yet identified as such the U.S. was the leader in CO2 emissions the massive Chinese modernization was just underway devastating hurricane landfall...
That was the assumption that, in the study of paleontology, the most simple fossils were always in the oldest strata, laid down first; while, as we progress into strata of later deposition, the fossils found in them become gradually more complex, tending toward advancing intelligence. That ...
Comparisons between computerised scans of fossils and modern animals have shed light on the hunting methods used by prehistoric members of a group of mammals known as carnivorans. These include modern-day foxes, wolves, cougars and leopards. ...
A happy cell is a balanced cell, but for every stupendously twisted protein it creates, it must tear the old ones asunder. That means untangling a convoluted pretzel-like mass for recycling. Cdc48 plays a critical role in unraveling the spent proteins.
the Sun. He calculated that the Sun would have taken22 million yearsto condense down to its current diameter and temperature from a diffuse cloud of gas and dust. Although this was inaccurate, Helmholtz correctly identified that the source of the Sun’s heat was driven by gravitational ...