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 .
About 30-27 kya, after Neanderthals made their final exit, the only other humans on Earth were “,” hiding in their refugia. They disappeared around when behaviorally modern humans arrived, too. For the “hobbits,” a volcanic explanation has been proffered for their extinction, although they probably coexisted with modern humans. A problem I have noticed with the arguments of human-agency skeptics is that the fossil and archeological record is currently too thin and the dates too equivocal to confidently place closely occurring events in sequence and establish causal relationships that precludes human influence. In all such extinctions, I have seen no convincing arguments and evidence that rules out the involvement of
The Camel - The Ship of the Desert - Riyadh
This chapter presents several energy and chemistry concepts essential to this essay. Even though scientists do not really know what energy (they do not know what light or gravity , either), energy is perhaps best seen as motion, whether it is a photon flying through space, the "orbit" of an electron around an atom's nucleus or of Earth around the Sun, an object falling to Earth, a river flowing toward the ocean, air moving through Earth's atmosphere, rising and falling tides, and blood moving through a heart.
24/03/2013 · Short Essay on 'Conserve Water, ..
In 508 BCE, Athens entered its classical period, which lasted for nearly two centuries. In those two centuries, so much was invented by Greek philosophers and proto-scientists that it has been studied by scholars for thousands of years. One provocative question that scholars have posed is why the Industrial Revolution did not begin with the Greeks. The answer seems to be along the lines of Classic Greeks not having the social organization or sufficient history of technological innovation before wars and environmental destruction ended the Greek experiment. The achievements of Greece over the millennium of their intellectual fecundity are far too many to explore in this essay, but briefly, the Greeks invented: , , , the , a monetized economy, thought, such as , while developing other branches to unprecedented sophistication, and , which included the idea that . Long after the Classic Greek period was over, Hellenic intellectuals and inventors kept making innovations that had major impacts on later civilizations, such as Heron of Alexandria (or some other Greeks) inventing the and .
Short Essay on 'Camel' (100 Words) Sunday, ..
By the end of the Old Kingdom around 2200 BCE, elephants, rhinos, wild camels, and giraffes were locally extinct in the Nile valley or on the brink of it. Old Kingdom ships sailed to Lebanon to raze their trees by 2650 BCE, which was a century before the . Slaves do not seem to have built the pyramids, but mainly during the off-season. The entire Giza complex was built in about a century and remains the ultimate elite-aggrandizing monumental architecture. It has been estimated that all the energy of Egypt’s agricultural surplus for a century was devoted to building the complex at Giza. Ancient Egypt reached the height of its power during the reign of in about 1350 BCE. Amenhotep III claimed that he personally killed 102 lions; hunting lions was the ultimate sport of pharaohs, after . , the pharaoh with the resplendent tomb, ruled a generation after Amenhotep III. The lives of thousands of slaves paid for the solid gold coffin and the . (Source: Wikimedia Commons)