Agriculture
what does land provide that we need to survive
Food
Is mining a Renewable or Non-renewable
Non-renewable
where do people settle
where there is good land and fresh water.
Plants need lots of________
nutrients
what is the first word this subject starts with
desert
what do crops require
fertile land
How are resources mined
They are strip mined
what happened when settlements grew
cities and towns were built.
how do plants get their food
with photosynthesis
What is desertification
the process of once-fertile land that becomes depleted of its nutrients and moisture.
What amount of the land is able to be farmed on
one third
What is another way resources can be removed
by digging tunnels
how did people develop land
by creating buildings, bridges, and roads.
__________ help supply these nutrients and food.
Decomposers
where is the largest desert
Africa
What is one way new farmland is created
possible answers: draining wetlands, clearing trees, and irrigating deserts.
Strip mining exposes soil, which can then be _______ _____ ______ away.
Blown or washed
About how many square meters will have new buildings on them in the next 40 years
230 billion
______ ______ happens when the soil loses these nutrients and food.
Nutrient Depletion
Name 2 ways desertification can happen, A: Terraforming, Overgrazing, Droughts
Terraforming, Overgrazing, Droughts
what is one another reason crops are grown
food for animals, grazing land for livestock, and growing crops like cotton for clothes.
Strip mining removes a _____ __ _____ to obtain minerals.
strip of land
what percent of the usa's buildings were constructed before 1980
about 50%
Eight oranges now have the same amount of vitamin A _______ number of oranges in 1980
1
Any ideas on how to reclaim land from desertification?
filling submerged areas with sand, rock, or cement, or by draining marshes using dikes.