What are the major theories explaining the disappearance of the dinosaurs? Dinosaurs lived between 230 and 65 million years ago. Dinosaurs then disappear as if they were never on earth. There are many theories in the world about the death of the dinosaurs. Archaeologist discovers the the bones of dinosaurs from different time periods.
Why does Mexico have such a strong pollution rate? Mexico is surrounded by mountains on three sides, it is also 2,240 meters above sea level, this causes Mexico to have less oxygen, this causes pollution to increase rapidly. Diesel fuels do not burn in the correct form in this altitude, which causes high amounts of black carbon. This investigation will aim to test the effects of air pollution on endangered specie populations in Mexico, this is a very serious global issue since many of the beloved animals that are living in our world are despairing due to human mistakes and carelessness. To test air pollution Research Question: What is the effect of air pollution on endangered species population in Mexico?
The Oxford dictionary defines extinction in relation to biology as a species, family or a large group having no living members (Oxford, 2016). With the estimation of the four billion species that evolved on earth during its 4 billion year existence, about 99% of them now are extinct (Novacek, 2001). This displays how natural extinction is, but it is usually stabilized by speciation (Barnosky, 2011). A major extinction event is one in which many species meet their end over a short period of time, these events are grand in scale and many species of all ecological types (i.e. animals and plants, aquatic and terrestrial) all around the world are involved (Benton, 2011).
Pigeon meat was commercialized as cheap food, resulting in hunting on a massive scale for many decades. There were several other factors contributing to the decline and subsequent extinction of the species, including shrinking of the large breeding populations necessary for preservation of the species and widespread deforestation; which destroyed its habitat. A slow decline between about 1800 and 1870 was followed by a rapid decline between 1870 and 1890. The last confirmed wild bird is thought to have been shot in 1900. The last captive birds were divided in three groups around the turn of the 20th century, some of which were photographed alive.
Not only were thousands of fish, sea otters and bird remains found but billions of dollars were consumed in the cleaning up process. The Exxon Valdez is still one of the most devastating oil spills in American history. Another devastating environmental disaster is the thermonuclear device called Castle Bravo. Castle Bravo was predicted to produce only six megatons of nuclear power but it furnished fifteen megatons of nuclear power, resulting in a radioactive cloud which rained down on the residents of
Over one thousand otter carcasses were found and an estimated two thousand eight hundred died from the spill. As a direct result of the spill, roughly three hundred harbour seals died. The oil spill later on caused a collapse of the Pacific Herrings’ population because nearly half of their eggs laid in 1989 were exposed to the oil (Liszka 1-30). These deadly outcomes changed their environment
Out of those inhabitants, only 6,000 are native speakers of the language (Powers, 2009). Today, the population of first-language Lakota speakers is estimated to be 2,000. This number is barely 2% of the total population of Lakota. The language is speculated to become extinct in the near future. Why Lakota Language Is Dying A significant epidemic of smallpox destroyed more than half of Lakota tribes between 1722 and 1780 (Irvine & Gal, 2008).
One of the main reasons for the cause of climate changes is greenhouse gas emission. “Current emissions are several times higher than the sustainable level, and increasing.”(Randers, 2008) The climate has been having drastic changes due to the amount of burning fossil fuels and deforestation that deteriorates the ozone layer and changes the global temperature. The reduction of greenhouses is possible, but even if we stop man-made emissions tomorrow it would still take about a hundred years until the emissions levels ware able to arrive to the pre-industrial levels because of the inertia in the global system. (Randers,
The quake cost 3,000 people their lives and not only rattled the residences of San Francisco, but people from Oregon to L.A and as far inland as Nevada(history.com). The quake ran down the San Andreas fault for 296 miles.The total damage estimation is $500,000,000 and very little of that is from the earthquake directly(history.com). Much of the destruction originated from fire. Many small fires across San Francisco grew into very large fires that demolished the city. The fires obliterated 490 city blocks, a total of 25,000 buildings leaving over 250,000 homeless (eyewitnesshistory) and, websites are conflicted but estimate the loss of 450 to 3,000 lives.
In 2010, the biggest earthquake since 1770 struck Haiti, causing over 250,000 deaths and affecting at least three million people, drastically increasing the level of poverty (“Top 5 Facts about Poverty in Haiti”). The earthquake destroyed practically everything, leaving the country in ruins. The small amount of infrastructure in Haiti was destroyed, leaving the government with no way to organize and regulate life. Left without an economy, the country was impossible to save. The World Bank estimates that the earthquake caused eight million dollars in damage, leading the country further into poverty (“Top 5 Facts about Poverty in Haiti”).