Precambrian

There are four different periods of the world known as eras. The four different eras are the Cenozoic, Mesozoic, Paleozoic and the Precambrian time. They all were separated by mass extinctions. A mass extinction is when a species has died out completely. The Precambrian time is the time when the earth began. Scientists think that the early earth was very different than it is now. They think that the atmosphere was made of gases such as water vapor, carbon dioxide, and nitrogen. Cyanobacteria is the

277 river miles long, a mile deep and at it's widest point 18 miles wide. (https://www.nps.gov/grca/index.html). Full of color and decorated by a variety of formations crafted by nature's artful hand this natural wonder draws about five million people every year who participate in a range of activities from hiking and camping to white water rafting. While many stare in awe and appreciation at the breathtaking view the Grand Canyon has to offer few take time to contemplate its beginnings millions

existed in the past. Merriam webster dictionary says “evolution is a process of change in a certain direction”. Teachers friendly guide says that “We study evolution to know more about the world we live in today.” Evolution summed up is change. Precambrian time is most of the Earth's history, starting with the planet's creation about 4.6 billion years ago. There are many theories on how life began. Some people say there was a “Big Bang” that happened 4.6 billion years ago. Scientist say that some

occurs every several hundred or thousand years. Signs of the fault at work can be seen through the mouth of the canyon with the orange Tintic Quartzite which is dated back to the Cambrian Age. Layered beneath the quartzite is tillite from the Precambrian Age. To the west and separate from the Quartzite and tillite by the Wasatch Vault are limestone sections from the Missippian Age. (Rigby, Hintze, 1968, pg 23). The earliest known local history of Rock Canyon

(National Park Service, 2015a). 5. Black Hills 5a. Geology The Black Hills are made up of an inner igneous and metamorphic core with sedimentary rocks surrounding that core. The center of the Black Hills is made up of Precambrian rocks with granites as old as 2.5Ga and gabbros of 2.15Ga (Palmer and Palmer, 2009). The granite

The being depicted in the sculpture here is what is known as an “Elder Thing”. First appearing in Dreams in the Witch House by H.P. Lovecraft, these extraterrestrial beings are far from human. The Elder Things are a race of half-vegetable, half-animal beings, having the feature of plants and animals simultaneously. They are capable of reproduction via spores and enter into states of death-like hibernation, yet they also eat and move and have minds of their own. In the Lovecraft story, At the Mountains

Galileo’s use of the telescope in 1609 revolutionized the field of astronomy because his observations disproved the geocentric theory and provided strong evidence for the Copernican/Heliocentric system. Galileo discovered four satellites orbiting Jupiter; this observation contradicted the geocentric theory by proving that it is possible for objects to orbit something other than Earth. His observation of the phases of Venus supported the heliocentric theory because he discovered they were similar

Lets take a trip back in time to 1884 in the Black Hills of South Dakota. A New York lawyer had just traveled there to inspect mining claims in that region. The man 's name was Charles E. Rushmore. Rushmore was curious by one of the mountains and asked a towns person what the name of the mountain was. The towns person replied saying it had no name. From then on Charles Rushmore started calling it Rushmore Peak. Over time it became known as Mount Rushmore (history.com). During the following years

Ice ages are well documented in Earth’s history, and they are proven to be relatively frequent. But what if that ice age persisted over not just regions near the poles, but around the equator as well? The term “snowball Earth” refers to a condition where Earth is completely covered by ice. Evidence indicates that snowball Earth may have been around in the Neoproterozoic. In fact, evidence points to the conclusion that these conditions happened three separate times in the Neoproterozoic. A snowball

Anyone well acquainted with Blackstone Lake, would have noticed that Black Rock Island is not like any of the other 8 islands. Nor are its rocks like the mainland, even just across from it, a mere 30 m to the north. Whereas most the grey rocks around the lake are granite gneisses or the darker mafic rocks with the pinker ones having more feldspar, Black Rock Island is very black as its name reflects. They feel denser as well, and a close inspection, especially on the west or north west side has peculiar