Earth History

Fossil

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

PreserveProtect from total destruction and maintain

some of the original state of being.

OrganismForm of life.

MoldShape formed by being encased, or sealed.

CastSolid outcome of a mold.

EvidenceProof on how and when something existed.

ExistingTo continue to be found on Earth.

SurfaceOuter, most exposed layer.

WeatheringDecomposing rock by wind, water, or

pressure.

ErosionThe process of rock being moved to a

different location by weathering.

SoilRock broken down in to fine substance, such

as sand, silt or clay.

DepositionThe transported rock fragments or sediments

are laid down or deposited in a process. Most end up in the sea from rivers.

ChemicalElement that dissolves the properties of

another material, such as oxidation or acid rain.

SubtleNot obvious; very little change.

DrasticExtreme change in a short period of time, or

extreme force.

RapidHappening within a short time, or moving

quickly at a high speed.

VolcanoA vent that connects the surface of Earth to a

deeper, hotter layer called the inner mantle.

Volcanic EruptionOpening of the Earth’s crust that allows, lava,

rock, gases, and ash to pushed out with force.

PressureForce placed on an object.

CrustThe 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.

EarthquakeBreak or movement which creates a strong

vibration from the force of sudden energy being released due to being pushed together or pulled apart.

VibrationMovement of energy in one direction and

then back in the other direction.

LandslideMass of rock, soil, and debris that is broken

away and forced down and incline due to a strong force of gravity.

InclineDegree of a slope.

GravityForce pulling together all matter.