Geologic Timeline Reflection

The 3 major events of Earth's history are the creation of Earth, concentration of atmospheric oxygen increasing, and the "Cambrian explosion."Humans and living animals would not exist without the Earth's creation. Without oxygen on Earth increasing, we would not survive because the oxygen amount will be so little for us to breathe in. However, without the "Cambrian Explosion," we would not have the food that is needed to survive, since animals are the primary food source for humans. Without all three major events, Earth will not be having a "green" environment as it is.

Scale of Earth history starts with Hadean Period, Precambrian Era, Paleozoic Era, Mesozoic Era, and finally the Cenozoic Era. The Precambrian Era is subdivided into Archeozoic and Proterozoic periods, Paleozoic Era subdivided into Cambrian, Ordovician,Silurian, Devonian, Carboniferous, Permian periods, Mesozoic Era subdivided into Triassic, Jurassic, Cretaceous period, and lastly, Cenozoic Era is subdivided into Tertiary(Paleogene and Neogene), and Quaternary period. What surprised me was after the Diversification of early vascular plants, the diversification of bony fishes existed before extensive forests of vascular plants form, since I thought after the diversification of the earliest plants would come the existence of these plants. Also, after the diversification of flowering plants was the major radiation of mammals, bird, and insects, instead of Angiosperm(the flowering plant) dominance increases since the dominance of a flower consists the process of creating and diversificating it.

The short time we had on Earth really made a big impact by increasing the global health of our environment, maintaining diversity among our planet, and most importantly, caused more concentration of oxygen in the atmosphere by the increase of human population each year. However, without the preceding events before the existence of humans such as the oxygen increasing, Cambrian Explosion, and diversification of marine life, we would not be having the happy experience of living in a good Earthly environment. The recycling we try to do as humans, also helps out with Earth to maintain a greener environment.

The questions I have is based on past evidence before the Existence of Earth and its' land and sea creatures, along with humans, when will Earth end? While scientists say that the increase of human population will cause the Earths' carrying capacity to be eventually full and explode, the movie"Story of Stuff" says that if we keep do not recycle our trash and continue burning trash, Earth will not exist. Also what will be the aftermath of Earth after humans die? Will a new kind of species exist? Or will Earth will just die itself?