strike and dip

• Dip is the acute angle a surface makes with a horizontal plane. 
• Strike is the orientation of the line perpendicular to this. 
• Strikes and dips are measured using a compass-clinometer 
• Strikes and dips are used to identify and describe geological structures:

  • Bedding planes
  • Foliation 
  • Cleavage 
  • Joints 
  • Faults 
  • Dykes 
  • Sills 
  • Ore veins 
  • Fold axis