natural resources/whaling/ air / forests Flashcards
name 6 natural resources
- water
- air
- forests
- soil
- animals
- marine life
what is living things
this includes plants and animals that live on land or water in rivers lakes and the sea animals that live in sea are called marine animals
give 5 examples of non living things
- Air
- Coal
- Water
- Minerals
- Oil
how can natural resources be valuable to us
- helps us to stay alive -we drink water,breathe oxygen and eat fish from rivers
- use as a source of energy - wood and coal we burn
- for building and manufacturing - iron used to make steel, clay used to make bricks
- create work - manufacturing things as well as in tourism
explain whaling (8)
whaling was initially only near coastal waters.(1)
early whaling affected the development of cultures as in Norway and Japan.(1)
the basque were first to catch whales commercially.(1)
they dominated the trade for 5 centuries.(1)
the first modern techniques were firstly large spears called harpoons(1)
then they used guns (1)
whales population fell dramatically (1)
who is a basque
a group of people living in Spain/France
name and explain 3 main whale products
Blubber- fatty tissue keeping whale warm-melted down to make oil for soap,margarine,cooking fat ,candles,cosmetics
Ambergris-wazy substance used to fix scent in perfume
Meat-very popular in Japan
explain what happened to the SA whales
South Africa joined many other countries in 1979 by banning whaling .the feeling with all countries involved were that whaling was cruel and unnecessary
products made from whales can also be made from other resources
what does the atmosphere do
the atmosphere is a layer of gases, known as air, that surrounds the Earth and is kept in place by the Earths gravity.
the atmosphere of Earth protects life on Earth by absorbing the harmful ultraviolet rays of the sun . This helps to warm the surface of the earth and also ensures that temp extremes between day and night does not occur
name all of the layers and how far up they are
- Exosphere 700 to 10 000 km
- Thermosphere 80 to 700 km
- Mesosphere 50 to 80 km
- stratosphere 12 to 50 km
- Troposphere 0 to 12 km
what does the air consist of
78 % Nitrogen 20% Oxygen Small amount of Argon carbon dioxide also contains water vapour on average 1 % at sea level and 0.4% in the entire atmosphere
TRUE OR FALSE
all layers of the atmosphere is the same pressure
FALSE
is there a definite boundary between the atmosphere and outer space
NO
why do mountain climbers need oxygen masks when they climb everest
the higher the altitude the thinner the air becomes and the harder it becomes to breathe
explain the use and abuse of forests
the destruction of forests have become a major problem .this is revered to DEFORESTATION. Every year 200 000 km2 of tropical rainforests are being destroyed. if this go’s on there will be no tropical rainforests by 2020
explain why are forests being destroyed
WOOD
the forests produce the best timber. there is an annual increase of demand for this timber. the tropical countries have earned much needed foreign exchange by selling wood
LAND
Forests have also been destroyed to make land available for agriculture and industry. The growing world population exercises pressure through the increased need for food and all possible areas are utilised for this. The fertility of the the ground in these forests is actually very low and their agricultural production is minimal.
MINNING
deposits of iron ore,gold,silver,nickel,copper is exploited here.this leads to destruction forests. it results i pollution that causes acid rain
INFRASTRUCTURE
the building of roads and railway lines and urbanisation has also led to the destruction of forests. The building of dams has led to flooding that has further destruction of forests. Exhausts fumes from cars has also helped with creating acid rain
explain the results of continuing deforestation
shortage of oxygen
forests produce large amount of oxygen. the lungs of earth
reduction in rainfall
forests produce moisture
increased temp on earth
fewer trees in world the levels of co2 . pollution increase
increase of soil erosion
without binding effect of trees and root erosion increases. The agriculture potential decrease. Topsoil settles in dams and the silt fills them
homelessness and poverty
the inhabitants of these forests use the trees, fruits and animals from the forests to survive. They live directly from and in the forests. If all the forests vanish, they will have no recourse
shortage of medicines and healing resources
Medicine developed from plants. 10% of all medicines used in SA hospitals come from here. When forests destroyed stock of medicines will come to end
what does conserve mean
to protects from harm or loss
what does extinct mean
if a plant or animal species has died out and the effect on biodiversity on earth
what does conservation mean
Management of natural recourses and to protect it from humans
