What is
history?
History means events that happened in the past consist of dates, timelines, facts, name and
places.
What is
meaning of historian?
A historian is a person who studies and writes about
the past and is regarded as an authority on it.
Why do
historian study the past?
When historians examine past events, they try to find patterns. Historians want to uncover what life was like for the group they are studying, to see life through their eyes. They want to tell a true story.
What methods
do historians use to study the past?
They use different
methods:
- Asking questions
- Using tools
- examining
evidence
What is
archeology?
is the study of the
ancient and recent human past through
material remains.
is the
scientist who study the remains of past civilizations or groups of people.
What
is an archeological site?
a place
that archeologists explore to
look for the remains of ancient civilizations.
Clouds
What is
cloud?
A cloud is
large collection of very tiny droplets of water or ice crystals.
What is
the color of a cloud?
Clouds are white because light from the Sun is
white. As light passes through a cloud, it interacts with the water
droplets, which are much bigger than the atmospheric particles that exist in
the sky
Why do
clouds turn gray?
When clouds
get thick or high, their shadow can add gray or multicolored gray appearance.
What are
the colors of a rainbow?
The seven colors of the
rainbow are red, orange, yellow, green, blue, indigo, and violet
What color do
you have when you add all the rainbow colors together?
White
Why is the sun
yellow?
The reason that the Sun looks yellow to
us is because the Earth's atmosphere scatters higher wavelength colors, like
red, orange and yellow less easily. Hence, these wavelengths
are what we see, which is why the Sun appears yellow
How clouds are
formed?
The process of evaporation
followed by condensation causes the formation of clouds.
... On reaching a certain height, water vapor present in air condenses to form tiny
droplets of water. These water droplets collect to form clouds that
float in air
Fog
What is
fog?
Is a
collection of condensed water vapor in cloudlike masses suspended in the air at
or near the earth's surface
How does
fog affect our daily life?
The fog and haze can increase the air
humidity and decrease the oxygen level. The low
temperature stimuli in the morning may more easily induce
acute onset of chronic respiratory or cardiovascular diseases in the elderly.
Therefore, we should avoid the outdoor activities in
the fog and haze if possible
Air pollution
What is air
pollution?
is the presence of substances in the
atmosphere that are harmful to the health of humans and other living beings, or
cause damage to the climate
What can you do to prevent indoor pollution?
1.
Proper ventilation. ...
2.
Don't smoke in or near the home. ...
3.
Eliminate odors instead of covering them. ...
4.
Prevent pests. ...
5.
Control pets. ...
6.
Dust often and well. ...
7.
Clean floors regularly. ...
8.
Keep floor mats at
every door.
What can you do to prevent outdoor pollution?
1.
Minimize air pollution from cars.
2.
Walk, bike or use public transportation.
3.
Save energy.
4.
Maintain your wood stove or fireplace.
5.
Recycle & buy recycled products.
6.
Consume less & choose sustainable products.
7.
Eat local, organic produce & less meat.
8.
Grow your own food.
Biomes
What
is a biome?
Is
a large community of plants and animals that occupies a large area with similar
climate and plants.
What
are marine biomes?
marine
biomes are the biggest biome
in the world! It covers about 70% of the earth. It includes five main oceans
What are
freshwater biomes?
Freshwater biomes are
communities of animals and plants in regions with water with less than 1% salt
concentration.
How do animals adopt to freshwater biome?
Many animals live in freshwater ecosystems.
Some need the movement of the stream or river to survive. In fast
moving waters, animals that have to hold onto rocks and the
bottom may have suction-cup like structures on their bodies. ... They can
adapt easily because there is no salt water and its not as deep
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