Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.

[EX Q]: Question: On which ridge does iceland sit? Answer: mid-atlantic ridge
[EX A]: Most mid-ocean ridges are located deep below the sea. The island of Iceland sits right on the Mid-Atlantic ridge ( Figure below ).

[EX Q]: Question: What part of the sweet potato store sugar from photosynthesis as starch? Answer: roots
[EX A]: Secondary growth of sweet potato roots provides more space to store food. Roots store sugar from photosynthesis as starch. What other starchy roots do people eat?.

[EX Q]: Question: What is the base unit that frequency is typically measured in? Answer: hertz
[EX A]:
The frequency , , is the number of cycles an object goes through in 1 second. Frequency is measured in Hertz (Hz). 1 Hz = 1 cycle per sec.