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The earth 2

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Biology L2

Biology L2


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  • 1. The earth Emmanuel Zuluaga Gómez
  • 2. The weather • The weather are the climatic changes around the world. The weather vary between countries; some countries can be hottest than others and some others can be coldest than others.
  • 3. The seasons • A season is a division of the year, marked by changes in weather, ecology, and hours of daylight. Seasons result from the yearly orbit of the Earth around the Sun and the tilt of the Earth's rotational axis relative to the plane of the orbit. • There are 4 seasons: spring, summer,autumn,winter.
  • 4. spring • Spring is one of the four conventional temperate seasons, following winter and preceding summer. When it is spring in the Northern Hemisphere, it will be autumn in the Southern Hemisphere. • At the spring equinox, days are close to 12 hours long with day length increasing as the season progresses. Spring and "springtime" refer to the season, and also to ideas of rebirth, rejuvenation, renewal, resurrection and regrowth.
  • 5. summer • Summer is the warmest of the four temperate seasons, falling between spring and autumn. At the summer solstice, the days are longest and the nights are shortest, with day-length decreasing as the season progresses after the solstice. but when it is summer in the Northern Hemisphere it is winter in the Southern Hemisphere, and vice versa.
  • 6. autumn • Autumn, interchangeably known as fall in the US and Canada, is one of the four temperate seasons. Autumn marks the transition from summer into winter, in September (Northern Hemisphere) or March (Southern Hemisphere) when the arrival of night becomes noticeably earlier and the temperature cools. One of its main features is the shedding of leaves from deciduous trees as they pave way for further growth.
  • 7. winter • Winter is the coldest season of the year in temperate climates, between autumn and spring. It is caused by the axis of the Earth in the respective hemisphere being oriented away from the Sun. but when it is winter in the Northern Hemisphere it is summer in the Southern Hemisphere, and vice versa. In many regions, winter is associated with snow and freezing temperatures. • At the winter solstice, the days are shortest and the nights are longest, with days lengthening as the season progresses after the solstice.
  • 8. Climatic changes In the last ten years earth is presenting many inusual climatic changes this is caused by the contamination and global warming in earth.
  • 9. Global warming • Global warming refers to an unequivocal and continuing rise in the average temperature of Earth's climate system. Since 1971, 90% of the warming has occurred in the oceans. Despite the oceans' dominant role in energy storage, the term "global warming" is also used to refer to increases in average temperature of the air and sea at Earth's surface.
  • 10. Global warming consecuences • One of the major changes in earth caused by global warming are the climatic changes, these climatic changes affect the world because earth temperature increase and the poles start to melt. • Global warming is not only affecting humans also the animals are starting to suffer global warming consequences.
  • 11. contamination • Contamination or pollution is the introduction of contaminants into the natural environment that cause adverse change. • Pollution is other major problem that affect earth ; it is also affecting animals and our society, the water is starting to dry and without water is not world.
  • 12. images