A solid in which particles are not arranged in a regular,
repeating pattern that often is formed when molten material cools too quickly to form crystals.
These lava rocks are a form of amorphous solid because the lava cooled too quickly to allow
crystals to form.
The energy-requiring process by which a solid changes directly to a gas without
first becoming a liquid.
When you apply water to dry ice it turns into a gas without first becoming a liquid.
For a crystalline solid, the temperature at which the forces holding
a crystal lattice together are broken and it becomes a liquid.
As the temperature rises, ice begins to melt becoming a liquid.