EARTH HISTORY PRESENTATION BY MS MUELLER EARTH HISTORY

EARTH HISTORY PRESENTATION BY: MS. MUELLER

EARTH HISTORY EVENTS BIRTH OF THE PLANET BEGINNING OF PLATE TECTONICS THE GREAT OXIDATION EVENT PANGEA THE TRIASSIC EXTINCTION

THE BIRTH OF THE PLANET WHAT IS IT? WHAT HAPPENED? WHO/ WHAT WAS THE EFFECT?

THE BIRTH OF THE PLANET WHAT IS IT? A steady, gradual, chaotic process that occurred when two “planet” type meteors crashed into each other. (Alper, par 3) WHAT HAPPENED? This crash of the planets created a fiery ball of flames that eventually cooled and became what we know today as Earth WHO/ WHAT WAS THE EFFECT? This was a million year long process just for the crash and the formation of the hot ball of magma. This eventually helped form the inner and outer core of the Earth we know today (Alper, par 6)

THE BEGINNING OF PLATE TECTONICS WHAT IS IT? WHAT HAPPENED? WHO/ WHAT WAS THE EFFECT?

THE BEGINNING OF PLATE TECTONICS WHAT IS IT? Discovered in 1995, the plates serve as boundary lines where the Earth’s lithosphere is said to move slightly over millions of years. The theory is based on the observation that the earth’s solid crust is broken up into 13 major plates and a few smaller semirigid plates. (“Plate techtonics” par 2). WHAT HAPPENED? WHO/ WHAT WAS THE EFFECT? “The boundaries between the plates are of three types: midocean ridges, where plates diverge; deep-sea trenches, or “subduction” zones, where two plates converge and one dives under the other; and transform, or “strike-slip, ” faults, where plates slide past each other. ” (“Plate Techtonics” par 1)

THE GREAT OXIDATION EVENT WHAT IS IT? WHAT HAPPENED? WHO/ WHAT WAS THE EFFECT?

THE GREAT OXIDATION EVENT WHAT IS IT? This is a time in Earth’s history when oxygen gas (O 2) first began to build up in the atmosphere. WHAT HAPPENED? Before about 2. 4 billion years ago, Earth’s atmosphere and oceans held almost no oxygen. Scientists believe that after 2. 4 billion years ago, O 2 began to build up in the atmosphere. This gradual build-up of oxygen appears to have continued for the next 2 billion years. (“great oxidation event” par 4) WHO/ WHAT WAS THE EFFECT? This time period coincides with the appearance of the first animal fossils. Almost all organisms use food for energy more efficiently when oxygen is available. Scientists think that an atmosphere with O 2 at or near to its present level is essential for the development and maintenance of complex multicellular life. (“Great oxidation event par 3).

PANGEA WHAT IS IT? WHAT HAPPENED? WHO/ WHAT WAS THE EFFECT?

PANGEA WHAT IS IT? a giant continent that most scholars believe existed about 200 million years ago. Geologists often refer to Pangaea as a supercontinent because it contained nearly all of Earth’s land. “Pangea par 1) WHAT HAPPENED? WHO/ WHAT WAS THE EFFECT? “Two connected land masses made up Pangaea. The southern region, called Gondwanaland, included what are now South America, Africa, India, Australia, and Antarctica. The northern mass, known as Laurasia, consisted of what are now North America, Europe, and Asia. A large, wedge-shaped gulf called the Tethys Sea filled the angle between Laurasia and Gondwanaland. ” (“Pangea” par 2)

THE TRIASSIC EXTINCTION WHAT IS IT? WHAT HAPPENED? WHO/ WHAT WAS THE EFFECT?

THE TRIASSIC EXTINCTION WHAT IS IT? During the final 18 million years of the Triassic period, there were two or three phases of extinction whose combined effects created the Triassic-Jurassic mass extinction event. (“Triassic-Jurassic mass extinction” par 1) WHAT HAPPENED? WHO/ WHAT WAS THE EFFECT? “Climate change, flood basalt eruptions and an asteroid impact have all been blamed for this loss of life. Many types of animal died out, including lots of marine reptiles, some large amphibians, many reef-building creatures and large numbers of cephalopod mollusks. Roughly half of all the species alive at the time became extinct. Strangely, plants were not so badly affected” (“Triassic-Jurassic mass extinction par 2).

KENTUCKY LAND

KENTUCKY LAND “Across Kentucky, natural outcrops and man-made excavations have exposed layers of rock strata. To a geologist, these layers are like the pages in a book, and each tells a part of the geologic story of Kentucky. Almost all of the rocks exposed at the surface of the State are sedimentary rocks. Sedimentary rocks are layered, and can often be traced across broad distances at the surface and beneath the surface. Geologists can determine the relative age of sedimentary rock layers from the fossils they contain. Similar layers can be grouped into units of strata, just as pages are combined into chapters in a book. On the geologic map above, each color represents a different age, or chapter in Kentucky's geologic history. These are very large groupings of rock strata based on the geologic time scale. Although on the map it looks as though each rock unit or chapter stops where the next begins, older units actually dip beneath younger units. So on the map above, the Ordovician strata is exposed in the center of the State, but continues beneath the surface in the areas where Silurian and Devonian (and younger) strata occur at the surface. Likewise, Ordovician through Devonian strata continue beneath the areas where Mississippian strata occur at the surface, and so on. ” (“geologic map of Kentucky” Par 1 -2).

ASTROBLEMES? Three sites in Kentucky bear the scars of ancient impacts by meteorites: the Jeptha Knob in Shelby County, a site near Versailles in Woodford County, and a site near Middlesboro in Bell County. A meteorite impact usually forms a roughly circular crater, called an astrobleme, and can crack the Earth's crust in a characteristic circular pattern. Astroblemes may show a "rebound structure" where a central core of rock has been brought up from deeper underground by the impact. The three Kentucky astroblemes represent the highly eroded cores of the astroblemes that were situated under the original craters; the crater walls eroded long ago. Each of these structures is characterized by a circular belt of arc-shaped faults cross cut by faults radiating outward from the central core of intensely broken rock. In the past, these structures were referred to as "cryptoexplosive" because their origin was uncertain.

OWEN COUNTY HISTORY Owen County is a county located in the U. S. state of Kentucky. As of the 2010 census, the population was 10, 841. [1] Its county seat is Owenton. [2] The county is named for Colonel Abraham Owen. [3] It is a prohibition or dry county, with the exception of a winery (Elk Creek Vineyards) that is authorized to sell its product to the public, [4] and limited sales within the incorporated city limits of Owenton. [5] https: //en. wikipedia. org/wiki/Owen_County, _Kentucky

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