Riley can either change the surface area of the object or can change the slipperiness of the material.
The answer is A-Gravity. Why? This is because B and C are examples of chemical weathering and not mechanical. Although choice D may seem viable lava intrusion is not a direct cause of mechanical weathering although lava pushing upward may help in aiding mechanical weathering it would not be considered a big enough cause, thus gravity is the correct answer.
Answer:
positive charge
Explanation:
Protons are positively charged
Answer:
answer is potasium means k