Question

One thousand years ago, less than 4 percent of habitable land was used for agriculture. Today, approximately 50 percent is used for agriculture. Which statement best explains why this large change occurred?(1 point)
Responses

As human population grows, more food is produced, causing soil quality to decline, so more land is needed to grow the same amount of crops.
As human population grows, more food is produced, causing soil quality to decline, so more land is needed to grow the same amount of crops.

The human population increased rapidly, which caused a subsequent increase in the demand for food.
The human population increased rapidly, which caused a subsequent increase in the demand for food.

Most humans live in urban areas, so rural areas are heavily developed to provide food for those densely populated urban areas.
Most humans live in urban areas, so rural areas are heavily developed to provide food for those densely populated urban areas.

Humans developed new agricultural practices which allowed the expansion of agriculture.

Answer 1

Humans developed new agricultural practices which allowed the expansion of agriculture.

Answer 2

In a chain of consequences after a forest is cleared, what is an immediate, direct impact?(1 point)
Responses

carbon dioxide is sequestered at lower rates
carbon dioxide is sequestered at lower rates

the greenhouse effect increases
the greenhouse effect increases

habitat is destroyed
habitat is destroyed

species go extinct
species go extinct

Answer 3

Habitat is destroyed.

Answer 4

Increasing population sizes lead to increasing demand for food. Farmers use synthetic fertilizers to add necessary nutrients to the soil so crops can grow. What is the ultimate consequence of this fertilizer use?(1 point)
Responses

deoxygenated water bodies
deoxygenated water bodies

fertilizer runs off with rainwater
fertilizer runs off with rainwater

death of aquatic organisms
death of aquatic organisms

algal blooms grow rapidly

Answer 5

Fertilizer runs off with rainwater.