3. Which of the following physical features are caused by plate tectonics?
mountains and volcanoes
rift valleys and mid-ocean ridges
strike-slip faults
all of these
http://www.ehow.com/info_8039880_landforms-caused-plate-tectonics.html
http://www.coolgeography.co.uk/GCSE/AQA/Restless%20Earth/Tectonics/Landforms_at_%20plate_%20boundaries.htm