What three components make up most magmas?
A) Silicon, potassium feldspar, and muscovite
B) Water, melted rock, and solid crystals
C) Lava, ash, and gas
D) Liquid portion, solid portion, gaseous portion
What is a suture?
A) A landmass accreted to a continent through subduction
B) The zone where two continents are welded together
C) The region of a mid-ocean ridge where it is bisected by a transform boundary
D) A fold-and-thrust belt created through convergence
Which of the following best explains the formation of a medial moraine on a glacier?
A) A gravel pile that marks periods of glacial readvancement
B) A ridge of debris carried down the center of glacial ice
C) Sands and gravels that fill a subglacial stream channel
D) A ridge of debris carried along the sides of an advancing glacier