Welcome!The Topic For Today Is…

Soil and Population ProfilesSoil Texture Population

ProfilesWhat Plants Need

World in Balance

Misc.

200 200 200 200 200

400 400 400 400 400

600 600 600 600 600

800 800 800 800 800

1000 1000 1000 1000 1000

Bonus Question: 5000 pts

Topic 1: 200• Question:• What is soil texture?• Answer• The relative size of the mineral particles that

make up the soil.

Back

Topic 1: 400• Question:• What are the three different words used to

describe soil mineral (inorganic) particles?• Answer• Sand (largest), silt (medium), clay (smallest)

Back

Topic 1: 600• Question:• What type of soil texture has good nutrient-

holding and water-holding capacity?• Answer• Clay (best), silt (good), sand (poor)

Back

Topic 1: 800• Question:• How does water-holding capacity relate to

aeration?• Answer• As one goes up, the other goes down (inverse

relationship).

Back

Topic 1: 1000• Question:• How does water-holding capacity relate to

water infiltration?• Answer• Inverse relationship (sand lets water flow right

through, doesn’t hold on to the water).

Back

Topic 2: 200• Question:• What does a population profile show?• Answer• The number of people in each age group in a

country.

Back

Topic 2: 400• Question:• What does the population profile of a

developing country like Kenya look like?• Answer• Pyramid

Back

Topic 2: 600• Question:• What does the population profile look like if a

country’s TFR has been stable at replacement level fertility?

• Answer• Column

Back

Topic 2: 800• Question:• What is the shape of a population profile in a

country with a graying population?• Answer• Inverted pyramid (kite)

Back

Topic 2: 1000• Question:• What happens to the population profile in a

country severely affected by the AIDS virus? • Answer• It loses a large number of working-age adults

(gets a “waist”)

Back

Topic 3: 200• Question:• The ability of soil to hold on to nutrients• Answer• Nutrient-holding capacity

Back

Topic 3: 400• Question:• What 2 factors influence nutrient-holding

capacity in soil?• Answer• Organic matter (humus)• Particle size (small is better)

Back

Topic 3: 600• Question:• The ability of soil to hold on to water• Answer• Water-holding capacity

Back

Topic 3: 800• Question:• The property of soil that lets roots “breathe”• Answer• Aeration

Back

Topic 3: 1000• Question:• The relative acidity of soil• Answer• pH

Back

Topic 4: 200• Question:• In India, how are fertility and education

related?• Answer• Inverse relationship

Back

Topic 4: 400• Question:• In sub-Saharan Africa, the age structure is

such that even if TFR falls to 2 instantly, the population will double in this century. This is due to….

• Answer• Population momentum.

Back

Topic 4: 600• Question:• What can change the status of women in a

country like India?• Answer• Access to education and job training

Back

Topic 4: 800• Question:• Describe the message of one family planning

poster• Answer• Answer varies

Back

Topic 4: 1000• Question:• What are reasons that the poor in developing

countries have large families?• Answer• Security in old age, infant mortality, helping

hands, cost of education, status of women, lack of available contraception

Back

Topic 5: 200• Question:• The property of soil that describes how easy it

is to cultivate• Answer• Workability…think about our clay soil

Back

Topic 5: 400• Question:• The process of soil being washed or blown

away• Answer• Erosion

Back

Topic 5: 600• Question:• The 2 things lost from soil first when soil

erodes are• Answer• Organic matter and small inorganic particles

Back

Topic 5: 800• Question:• Why does erosion lead to desertification?• Answer• The soil components lost first are the ones

that contribute to water-holding capacity.

Back

Topic 5: 1000• Question:• What makes soil too salty?• Answer• Irrigation: dissolved salt is left behind when

irrigation water evaporates.

Back

Bonus Question: 5000 pts.

• Question:• List 5 things that encourage fertility rates to

decline• Answer• Security in old age, decreased infant/child

mortality, universal education, opportunities for women, access to contraceptives

Back

Daily Double

Daily Double