Question

according to the passage, what is one benefit of biochar in soil?
a. it removes nutrients from plants
b. it releases carbon into the air
c. it helps soil stay fertile for thousands of years
d. it makes soil harder and drier

1. how does the diagram comparing oxisol and tpi support the passage?

a. it shows how rainforests were destroyed
b. it explains where charcoal comes from
c. it visually compares soil qualities described in the text
d. it shows how to make biochar step - by - step

1. why do scientists continue to study terra preta today?

a. to prove explorers were wrong
b. to learn how to grow rainforests
c. to improve poor soil and reduce climate problems
d. to discover ancient tools

1. why does the author include information about early european explorers in paragraphs 4 and 15?

a. to explain why explorers failed to find gold
b. to show how ancient cities were misunderstood for many years
c. to describe how europeans learned farming methods
d. to explain why rainforests were difficult to travel through

Explanation:

Question 8

• Option A: Biochar should help plants get nutrients, not remove them, so A is wrong.
• Option B: Biochar is carbon - rich and stores carbon, not release it into the air, so B is wrong.
• Option C: Biochar can improve soil fertility and make soil stay fertile for a long time, which matches the benefit of biochar in soil.
• Option D: Biochar improves soil structure, making it more porous and able to retain water, not harder and drier, so D is wrong.

• Option A: The diagram comparing oxisol and TPI is about soil, not rainforest destruction, so A is wrong.
• Option B: The diagram is about soil comparison, not the source of charcoal, so B is wrong.
• Option C: A diagram comparing two types of soil (oxisol and TPI) can visually present the differences in their qualities as described in the text, which is a common way diagrams support passages about soil.
• Option D: The diagram is a comparison of soils, not a step - by - step of making biochar, so D is wrong.

• Option A: Studying terra preta is not to prove explorers wrong, as the focus is on soil and climate, not disproving explorers, so A is wrong.
• Option B: Terra preta is about soil, not growing rainforests, so B is wrong.
• Option C: Terra preta has good soil properties. Studying it can help improve poor soil and also has implications for climate (since it stores carbon), so this is a valid reason for scientists to study it.
• Option D: Studying terra preta is about soil science, not discovering ancient tools, so D is wrong.

Answer:

C. It helps soil stay fertile for thousands of years

Question 9