Fossil Any remains, imprint, or trace of a living thing from the distant past.

Preserve Protect from total destruction and maintain some of the original state of being.

Organism Form of life.

Mold Shape formed by being encased, or sealed.

Cast Solid outcome of a mold.

Evidence Proof on how and when something existed.

Existing To continue to be found on Earth.

Surface Outer, most exposed layer.

Weathering Decomposing rock by wind, water, or pressure.

Erosion The process of rock being moved to a different location by weathering.

Soil Rock broken down in to fine substance, such as sand, silt or clay.

Deposition The transported rock fragments or sediments are laid down or deposited in a process. Most end up in the sea from rivers.

Chemical Element that dissolves the properties of another material, such as oxidation or acid rain.

Subtle Not obvious; very little change.

Drastic Extreme change in a short period of time, or extreme force.

Rapid Happening within a short time, or moving quickly at a high speed.

Volcano A vent that connects the surface of Earth to a deeper, hotter layer called the inner mantle.

Volcanic Eruption Opening of the Earth’s crust that allows, lava, rock, gases, and ash to pushed out with force.

Pressure Force placed on an object.

Crust The outermost solid shell of the Earth’s surface that consists of about 10 miles (16km) of rock and loose materials. Underneath the continents, the crust is almost three times as thick as it is under the oceans.

Earthquake Break or movement which creates a strong vibration from the force of sudden energy being released due to being pushed together or pulled apart.

Vibration Movement of energy in one direction and then back in the other direction.

Landslide Mass of rock, soil, and debris that is broken away and forced down and incline due to a strong force of gravity.

Incline Degree of a slope.

Gravity Force pulling together all matter.