You are given a science question (easy-level) and four answer options (associated with "A", "B", "C", "D"). Your task is to find the correct answer based on scientific facts, knowledge, and reasoning. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D'. There is only one correct answer for each question.

Solar radiation provides more heat near the equator than near the poles on Earth. The greatest amount of heat is moved away from the equator by
(A) ocean currents. (B) aquatic plants. (C) surface winds. (D) tectonic plates.
A

Kim lost her hammer outside. When she found it a few months later, some parts of the metal were covered with flaky, brown rust. Which type of change occurred when rust formed on the hammer?
(A) chemical (B) electrical (C) thermal (D) physical
A

Algae are organisms that live in water. Scientists discovered a new type of red algae near Knight Island in Prince William Sound. Which statement is most likely a positive effect of this discovery?
(A) Scientists studying the red algae are disturbing local wildlife. (B) The red algae may help scientists better understand local food webs. (C) Visitors to Alaska may want to collect the red algae and take it home. (D) The red algae may be moved by boat to other areas when people travel.
B