Biology L2

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