2Environment : MeaningThe word Environment has been derived from the French word ‘environner’ ; to encircle, or to surround.The dictionary meaning of the word Environment is a surrounding, external conditions influencing development or growth of people, animals or plants; living or working
3The Word "environment" is most commonly used describing "natural" environment and means the sum of all living and non-living things that surround an organism, .
4DEFINITION :Environment refers to the sum total of conditions which surround man at a given point in space and timeC.C. Park 1980The Environment is the aggregate of all external factors or conditions that influence the activities and existence of living things including man.
5The UniverseThe universe is commonly defined as the totality of everything that exists, including all space, time, matter, energy, planets, stars, galaxies, intergalactic space,
8Solar systemSolar system is comprised of one star (the sun) and nine planets circling around it. Planets, like stars, are basically chunks of matter. Our solar system includes the sun and nine planets.
11THE PLANET EARTHEarth (or the Earth) is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets. It is sometimes referred to as the World
12Cont.d…Earth formed 4.54 billion years ago, and life appeared on its surface within one billion years. The planet is home to millions of species, including humans. Earth's biosphere has significantly altered the atmosphere and other abiotic conditions on the planet.
14Pangaea, Pangæa, or Pangea (pronounced /pænˈdʒiːə/ pan-jee-ə, from Ancient Greek πᾶν pan "entire", and Γαῖα Gaia "Earth", Latinized as Gæa) is hypothesized as a supercontinent that existed during the Paleozoic and Mesozoic eras about 250 million years ago, before the component continents were separated into their current configuration
16The single enormous ocean which surrounded Pangaea was accordingly named Panthalassa
17Panthalassa (Greek Πανθαλασσά, meaning 'all sea'), also known as the Panthalassic Ocean, was the vast global ocean that surrounded the supercontinent Pangaea, during the late Paleozoic and the early Mesozoic years. It included the Pacific Ocean to the west and north and the Tethys Ocean to the southeast.
18It became the Pacific Ocean, following the closing of the Tethys basin and the breakup of Pangaea, which created the Atlantic, Arctic, and Indian Ocean basins. The Panthalassic is often called the Paleo-Pacific ("old Pacific") because the Pacific Ocean evolved from it.
23Geographic coordinates Coordinate values given as latitude and longitude. Latitude (shown as a horizontal line) is the angular distance, in degrees, minutes, and seconds of a point north or south of the Equator. Lines of latitude are often referred to as parallels.Longitude (shown as a vertical line) is the angular distance, in degrees, minutes, and seconds, of a point east or west of the Prime (Greenwich) Meridian. Lines of longitude are often referred to as meridians.
24Distance between Lines If you divide the circumference of the earth (approximately 25,000 miles) by 360 degrees, the distance on the earth's surface for each one degree of latitude or longitude is just over 69 miles, or 111 km.
25Minutes and Seconds For precision purposes, degrees of longitude and latitude have been divided into minutes (') and seconds ("). There are 60 minutes in each degree. Each minute is divided into 60 seconds.
26Relative Location of a city or destination on the planet is its relationship to another place or nearby landmarks.As an example, our U.S. office is on Galveston Island, located in southeastern Texas in the Gulf of Mexico, about 48 miles southeast of Houston. That's our relative location.
27Absolute Location is the definitive location of a place using a recognized coordinate system
28Meridian—An imaginary arc on the Earth's surface from the North Pole to the South Pole that associates all locations running along it with a given longitude. The position of a point on the meridian is given by its intersecting latitude. Each meridian is perpendicular to all circles of latitude at the intersection points
29Prime Meridian—The meridian of longitude 0 degrees, used as the origin for the measurement of longitude. The meridian of Greenwich, England, is the internationally accepted prime meridian in most cases
30EquatorWe can imagine the Earth as a sphere, with an axis around which it spins. The ends of the axis are the North and South Poles. The Equator is a line around the earth, an equal distance from both poles. The Equator is also the latitude line given the value of 0 degrees. This means it is the starting point for measuring latitude. Latitude values indicate the angular distance between the Equator and points north or south of it on the surface of the Earth
32Parallel—A circle or approximation of a circle on the surface of the Earth, parallel to the Equator and connecting points of equal latitude
33Earth StructureThe structure of Earth can be defined in two ways: by mechanical properties such as rheology, or chemically. Mechanically, it can be divided into lithosphere, asthenosphere, mesosphere, outer core, and the inner core. The interior of the earth is divided into 5 important layers. Chemically, Earth can be divided into the crust, upper mantle, lower mantle, outer core, and inner core.
34Layer Depth0–60 (Kms)Lithosphere (locally varies between 5 and 200 km)0–35Crust (locally varies between 5 and 70 km)35–660Upper mesosphere (upper mantle)660–2,890Lower mesosphere (lower mantle)2,890–5,150Outer core5,150–6,360Inner core
37Earth's Crust: There are two different types of crust: thin oceanic crust that underlies the ocean basins and thicker continental crust that underlies the continents. These two different types of crust are made up of different types of rock. The thin oceanic crust is composed of primarily of basalt and the thicker continental crust is composed primarily of granite. The low density of the thick continental crust allows it to "float" in high relief on the much higher density mantle below.
38Earth's Mantle: Earth's mantle is thought to be composed mainly of olivine-rich rock. It has different temperatures at different depths.The temperature is lowest immediately beneath the crust and increases with depth.The highest temperatures occur where the mantle material is in contact with the heat-producing core.This steady increase of temperature with depth is known as the geothermal gradient.
39The geothermal gradient is responsible for different rock behaviors and the different rock behaviors are used to divide the mantle into two different zones. Rocks in the upper mantle are cool and brittle, while rocks in the lower mantle are hot and soft (but not molten).Rocks in the upper mantle are brittle enough to break under stress and produce earthquakes.However, rocks in the lower mantle are soft and flow when subjected to forces instead of breaking.The lower limit of brittle behavior is the boundary between the upper and lower mantle.
40Earth's CoreThe core is divided into two different zones. The outer core is a liquid because the temperatures there are adequate to melt the iron-nickel alloy. However, the inner core is a solid even though its temperature is higher than the outer core.
42Types of Environment Environment are two types: Natural or Physical EnvironmentMan made or Cultural Environment
43Component of Environment Biotic component: Living thing including human being;Aquatic: animals , plants, microbesTerrestrial: animal, plants, microbesAbiotic component: Physical attributes;Water bodiesAirTemperatureWeatherLatitudeLongitude , etc.