When a cold air mass crashes into a warm air mass which kind of front is formed

Put these processes of the water cycle in the correct order, starting at the point where the water is in the lake: 1. water evaporates into the atmosphere 2. rain, snow, or other precipitation falls 3. water collects into larger bodies of water 4. water vapor condenses into liquid water

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.

Explanation for basic character?