Key Words: GEOLOGY UNIT 1.4
- Created by: Brad_ers_B
- Created on: 22-04-14 17:18
Bed - a unit of sedimentation, which can vary considerably in thickness
Bedding plane - marks the break between beds. Represents a break in sedimentation, a change in the composition or grain size, or a change in colour of the sediments
Dip - the maximum inclination of a bed measured from the horizontal using a clinometer
Strike - the direction at right angles to the dip. There is zero dip in this direction. It is a bearing measured from north using a compass
Apparent dip - a dip measure to be less than the maximum inclination
Tension - the force trying to pull rocks apart-the Earth's crust will be shortened
Shear forces - the forces which act along a plane in the rock and promote sliding along that plate
Competent - rocks that are strong and brittle but also tend to joint and fault
Incompetent - rocks that are weak and plastic that tend to fold and develop cleavage
A Joint - a fracture in competent rocks along which no observable movement has occured
Tectonic joints - formed as a result of folding and cause tension joints parallel to the acial plane and cross joints…
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