Igneous or sedimentary rock in its original state before metamorphism takes place (Lesson 27)

Weather condition that occurs in areas of low atmospheric pressure and usually results in some degree of precipitation (Lesson 28)

The region of the upper atmosphere in which temperature increases; includes all of the atmosphere above the mesosphere (Lesson 28)

Highest point or peak on an energy diagram; represents the highest energy point between the reactant's and product's transition state (Lesson 12)

The body of gases that surrounds a celestial body such as Earth (Lesson 28)

The last stage in the formation of sedimentary rock; formed when mineral material bonds with sediment clasts (Lesson 27)

Liquid portion of a solution or suspension that remains after a precipitate has settled to the bottom of the container (Lesson 13)

Magnetized material that can lose its magnetic properties (Lesson 24)

Permitting some light to pass through but diffusing it so that objects on the other side appear distorted or blurry (Lesson 22)

The lowest point on the Kelvin scale (Lessons 19, 31)