Are phase changes a physical change or a chemical change? Example: My icecream cone melted in the hot sun.

What does the symbol (–hfus) indicate in a phase change?

Why must humans find substitutes for many minerals found on earth? (a) form at an extremely slow rate (b) controlled by other countries (c) too deep in the earth to collect

He nucleus contains the cells genetic material in the form of dna. dna is organized into our chromosomes, which are made up of thousands of that determine our traits.