D Streak. The student is scratching it on white paper to test the streak.
Answer:
Dry gangrene
Explanation:
Dry gangrene occurs when blood supply to tissues gradually stops. The affected part becomes dry, shrinks and turns brownish to black (like a mummy). The line of separation is formed between the gangrenous part and the viable part of the tissue. The gangrenous part consists of inflammatory granulation tissue. It occurs mainly in diabetic patients or people suffering from arterial blood vessel diseases.
Answer:
It's All About the Plates
Heat from the Earth's interior causes this motion to happen via convection currents in the mantle. Over a period of millions of years, this slow motion caused the single supercontinent to split into the seven continents you see today
