Part 1. Definition
Based on the information present in the given passage, you need to write a correct answer to the given question. A correct answer is one that correctly and completely answers the question. Do not write answers that address the question partially or incorrectly. The correct answer must be contained in the given paragraph.
Part 2. Example
Paragraph- Sent 1: Obama was born on August 4, 1961, at Kapiʻolani Maternity & Gynecological Hospital in Honolulu, Hawaii.
Sent 2: He is the only President to have been born in Hawaii.
Sent 3: He was born to a white mother and a black father.
Sent 4: His mother, Ann Dunham (1942-1995), was born in Wichita, Kansas, of mostly English descent, with some German, Irish, Scottish, Swiss, and Welsh ancestry. Question: How old was Obama's mother when he was born?
Answer: 19.
Explanation: Obama was born in 1961. His mother was born in 1942 and 1961-1942=19. Therefore, any of the following responses are considred correct: '19' and 'almost twenty'.
Part 3. Exercise
Paragraph- Sent 1: A flood occurs when a river overflows its banks.
Sent 2: This might happen because of heavy rains.
Sent 3: Floodplains In very flat regions, flood water may spread out on the surface of the land.
Sent 4: It then slows down and drops its sediment.
Sent 5: If a river floods often, a floodplain develops.
Sent 6: A floodplain is an area where a thick layer of rich soil is left behind as the floodwater recedes.
Sent 7: Thats why floodplains are usually good places for growing plants.
Sent 8: They are very flat areas and they have very rich soils.
Sent 9: The Nile River valley is a great example of a floodplain.
Sent 10: Each year, the Nile River rises over its banks.
Sent 11: This floodwater carries a lot of sediment.
Sent 12: This sediment has been eroded off areas of land from upstream.
Sent 13: This sediment is dropped as the water slows down after spreading across the land.
Sent 14: What is left behind is a very rich soil.
Sent 15: Thats why crops can be raised in the middle of a sandy desert.
Sent 16: Natural Levees A flooding river often forms natural levees along its banks.
Sent 17: A levee is a raised strip of sediments deposited close to the waters edge. 
Question: What makes the floodplains good for growing plants?.
Answer:
Because the the sediment rich in minerals.