Question

3 group the labels according to the temperatures they describe.
vapor condenses directly to ice
water molecules form a crystal lattice
snow crystals create the most subtle shapes
vapor condenses around dust before freezing
snow crystals form with sharp tips
ice crystals are symmetrical
below -40 degrees celsius
both
above -40 degrees celsius

Explanation:

To solve this, we analyze each label based on temperature - related knowledge of water and snow crystals:

1. Below - 40 degrees Celsius:

• "Vapor condenses directly to ice" (deposition occurs more readily at very low temps).
• "Snow crystals create the most subtle shapes" (subtle snow crystal shapes are typical at temps well below - 40°C).
• "Snow crystals form with sharp tips" (sharp - tipped snow crystals form at very low temperatures like below - 40°C).

1. Both (Below and Above - 40 degrees Celsius):

• "Water molecules form a crystal lattice" (ice has a crystal lattice structure regardless of whether it's formed above or below - 40°C as long as it's frozen).
• "Ice crystals are symmetrical" (ice crystals show symmetry in their structure whether formed above or below - 40°C).

1. Above - 40 degrees Celsius:

• "Vapor condenses around dust before freezing" (this process of condensation around dust (to form ice nuclei) is more common at relatively higher sub - zero temps above - 40°C).

Answer:

• Below - 40 degrees Celsius: Vapor condenses directly to ice, Snow crystals create the most subtle shapes, Snow crystals form with sharp tips
• Both: Water molecules form a crystal lattice, Ice crystals are symmetrical
• Above - 40 degrees Celsius: Vapor condenses around dust before freezing