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1. The bookmarks indicated the following six events:
· Formation of the earth and moon 4.6 billion years ago
· Earliest life, 3.9 billion years ago
· Early land plants 420 million years ago
· Largest mass extinction 248 million years ago
· Dinosaur extinction 65 million years ago
· "Lucy", early hominid, 4 million years ago
2. In the Archaean period, there are cyanobacteria and stromatites.
3. The three periods of time that are described as eras are the Paleozoic, the Mesozoic, and the Cenozoic.
4. There are five mass extinction events listed. They are:
End-Orcovician, where many types of ocean life became extinct including trilobites, brachiopods, and graptolites. The Late Devonian, stromatoporoids, brachiopods associated with reefs and more trilobites all became extinct, as coral systems suffered heavy losses. The End-Permian extinction saw some corals, trilobites, and types of brachiopods, orinoids and shelled cephalopods all became extinct at this time. The End-Triassic extinction hit many of those same groups, along with corals, and the land-dwelling phytosaurs. The End-Cretaceous killed off the non-avian dinosaurs, pterosaurs, mosasaurs, some groups of cephalopods and bivalves.
5. The End-Cretaceous appears to have been caused by an asteroid that hit the earth that created...
The End-Triassic extinction was caused when Pangaea split, which created substantial volcanic activity, filling the atmosphere with carbon dioxide, leading to global warming.
Part II. Global Climate Change
6. The four greenhouse gases that are being measured by the simulation are carbon dioxide, water vapor, methane, and nitrous oxide.
7. The average temperature in the "Today" simulation is 59-60F. Adding clouds appears to do little, maybe up one degree. In 1750, the average temperature was around quite a bit lower, around 53-54F. The gas levels are as follows:
H20
CO2
CH4
N20
Present Day
70%
388ppm
1.843ppm
0.317ppm
1750
70%
280ppm
0.73 ppm
0.27ppm
Ice Age
?
180ppm
0.38ppm
0.215pm
During the ice age, the average temperature was a lot lower, bouncing around the 30sF.
8. The effect that greenhouse gases in the atmosphere are having is to increase the temperature of the planet. As the concentration of greenhouse gases in the atmosphere increases, the planet gets warmer. This reminds of the Ed-Triassic extinction, where volcanic activity released massive amounts of…
Climate Change Effects of Climate Change Economic effects of global climate change In this paper, we will discuss the economic effects of global climate change on rich as well as poor countries. Our emphasis will be on the point that the rich countries might have a difficult time but they can manage with the situation whereas the poorer countries will be impacted the hardest. Firstly let's review some of the facts regarding the
Climate Change A review of recent developments in climate change science. Initial Reaction. This is an eye-opener of an article. The facts presented in the journal Progress in Physical Geography show powerful evidence that the climate is changing faster than earlier believed. The Intergovernmental Panel on Climate Change (IPCC) empirical reports are fascinating to me, and understanding this global threat is important for all citizens. For those who believe conservative talk radio (global
Other effects observed worldwide include modifications in the distribution of plants and animals throughout and outside natural habitats, the fact that the trees start to bloom earlier than initially considered normal, the length of the seasons continue to increase, probably leading to a situation in which only two seasons with replace the traditional four. Foremost, ice has been found on rivers and the lakes freeze later in the winter and
Part 1: A Closer Look at the Evidence 1. The first graph on the NASA site shows the concentration of CO2 in the atmosphere, comparing across time. It shows that for all time, there were fluctuations in the level of CO2 in the atmosphere, but that the level always remained below 300 parts per million. The graph takes a sharp uptick in recent years, and by the time we get to
Global Warming and Climate Change Natural versus anthropogenic forces in climate change are a common topic for discussion. Some people believe that the global warming experienced now is part of a natural cycle while other others believe it is accelerated thanks to human evolution on earth. Although there is a natural cycle on the planet concerning global warming, this is not the case regarding the information provided from scientific data on
Global Warming Trends and Impact Global warming refers to the warming of the earth's temperature, in particular oceans and the layer of the atmosphere closest to the planet (Thompson, Lonnie & Gioietta 114). Thus far, the total temperature increase is documented at only about one degree (Weart 43). However, even this seemingly minor change can create ripple effects that present challenges for earth and mankind. Global warming and other climate change