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Science 20/8

Across
The top layer of soil
Sift through sediment or excavated material
The process of breaking rocks into smaller pieces
The study of prehistoric life
Soil composed of broken-down plant and animal matter
An isolated hill or mountain
Natural earthy material with fine particles
A substance that gives colour
A large volume, destructive ocean wave
Down
Movement of weathered material
Seismic activity
Study of the Earth including rocks and landforms
Rapid fall of snow
The layer of rock underneath subsoil
A violent tropical storm
Search for valuable materials or artefacts in the Earth
The layer between topsoil and bedrock
A fertile soil
Something that causes an effect
The top layer of the Earth's surface