Acidification of the Oceans Essay ..

When that likely human ancestor made the , it was the culmination of a process of increasing encephalization and manipulative ability that probably began its ascent with and accelerated when humanity’s ancestors became . and applying those findings to humanity’s ancestors is problematic, but there has probably not been significant evolution in great apes since they descended from the last common ancestor that they shared with humans, particularly chimpanzees. About one mya, and became a separate species, but for many years scientists did not realize it. Another chimpanzee split about 1.5 mya created east and west chimp species that are virtually indistinguishable today. It is widely considered to be very likely that the last common ancestor of chimps and humans looked like a chimp.

Essay - Introduction The oceans of the earth are a massive part ..

Energy and the Human Journey: Where We Have Been; …


When the total continental land mass was small or combined into a supercontinent, there was no land to divert that diffusion of warm water toward the poles, which results in currents. During those times, the global ocean became one big, calm lake, with no currents of significance. Those oceans are called today, and they would have been anoxic; the oxygenated surface waters would not have been drawn by currents to the ocean floor, and the oceans were certainly anoxic before the GOE. The interplay of those can be incredibly complex and lead to the multitude of hypotheses posited to explain those ancient events, but a leading hypothesis today is that a combination of factors, including supercontinents, variations in volcanic output, Canfield Oceans, and ice ages prevented life from gaining ecosystem dominance until the waning of the second Snowball Earth event, which was the greatest series of glaciations that Earth has yet experienced. It is known today as the , which ended about 635 mya. The study of the Cryogenian Period, which is the subject of , resulted in the term “.”


During that “,” , , and the rise of grazing and predation had eonic significance. While many critical events in life’s history were unique, one that is not is multicellularity, , and some prokaryotes have multicellular structures, some even with specialized organisms forming colonies. There are , but the primary advantage was size, which would become important in the coming eon of complex life. The rise of complex life might have happened faster than the billion years or so after the basic foundation was set (the complex cell, oxygenic photosynthesis), but geophysical and geochemical processes had their impacts. Perhaps most importantly, the oceans probably did not get oxygenated until just before complex life appeared, as they were sulfidic from 1.8 bya to 700 mya. Atmospheric oxygen is currently thought to have remained at only a few percent at most until about 850 mya, although there are recent arguments that it remained low until only about 420 mya, when large animals began to appear and animals began to colonize land. Just as the atmospheric oxygen content began to rise, then came the biggest ice age in Earth’s history, which probably played a major role in the rise of complex life.

Essay on “Indian Space Programme-ISRO” Complete Essay …
We should try to preserve this wonder because it has a historical significance, ..

Johnson drank his tea in oceans.” (Compare with litotes, ..

I developed my current approach by trial and error that was extremely hazardous and painful, and took most of a lifetime to achieve. I hope that this essay can help shorten the learning curve for those whom I seek. Many readers of this essay will get bogged down early on and skip to the end, and they will get out of the experience what they put into it. Such people are not in my target audience, unless they have already mastered this essay’s material, but I have never met even one such person. I will continue studying this subject matter for the remainder of my life, and have a ways to go before I can consider my grasp of it firm. This essay is largely intended to help readers develop a comprehensive awareness of life’s journey on Earth and see when humanity enters the play. When readers can do that and come to appreciate it, they will have an easier time avoiding the egocentric levels of FE awareness (), and reach something that might be called soul-centric. It should help them shed not only those scarcity-based ideologies and their insidious, , but they should also begin to understand why approaches rooted in such ideologies are doomed to failure for this task. We cannot drag our scarcity-based baggage with us for establishing a world of abundance. The GCs are masters of using people’s allegiance to those ideologies to enslave their minds and spirits. What I will be asking of my target audience will be anything but easy, and can actually be quite dangerous if caution is not exercised. But for those who use this material properly, it can improve their understanding in important ways.

In the film The Deep End of the Ocean, ..

Oceans, Ice, and Rocks - American Chemical Society

After as little as a half-million years of bedraggled survivors adapting to ice age seas, the ice sheets retreated and the oceans rose. The of the time may have also changed, and upwelling, anoxia, and other dramatic chemistry and nutrient changes happened. Those dynamics are suspected to be responsible for the second wave of extinctions. There also seem to have been .Atmospheric oxygen levels may have fallen from around 20% to 15% during the Ordovician, which would have contributed to the mass death. Seafloor anoxia seems to have been particularly lethal to continental-shelf biomes, possibly all the way to shore. It took the ecosystems millions of years to recover from the Ordovician-Silurian mass extinction, but basic ecosystem functioning was not significantly altered in the aftermath, which is why a has been proposed as a more significant extinction event. The were laid down by the . Most oil deposits were formed in the era of dinosaurs and the processes of oil deposit formation were similar; they were related to oceanic currents. When currents came to shore via the bottom and the prevailing winds blew the top waters offshore, it became a and anoxic sediments could form. When the winds blew onshore and left via the bottom, the waters became clear and are known as nutrient deserts. The oscillation between nutrient traps and nutrient deserts can be seen in oil deposit sediments. In the mid-20th century, Soviet scientists revived an old hypothesis that oil was , a variation of which was also championed by , but improving tools and investigation invalidated those hypotheses. No petroleum geologists today seriously consider the abiogenic origin of hydrocarbons. Oil sediment formation events seem related to mantle and crust processes that created high sea levels and anoxic events, and the last great one was in the , which formed more than 10% of the world's oil deposits.

Introduction - Protect Planet Ocean

Oceans are the lifeblood of planet Earth and humankind

So far, this essay has dealt lightly with regional differences and largely confined the discussion to polar, temperate, and tropical conditions in the seas, and rainforest versus dryer conditions on land. While existed, barriers to species diffusion on land were relatively modest, hence dominance. But at the Triassic’s end, and continental differences in plants and animals often became significant in later times. Although the formation of Pangaea had profound impacts, because land life was relatively young, the differences and resultant changes due to the removal of oceanic barriers were less spectacular than would happen in the distant future, such as when .