S8 - Chapter 7 Practice Vocab

hypothesis that continents are in constant motion

• continental drift
• Pangea
• magnetic reversal
• theory of plate tetonics

naturally preserved remains, imprints, or traces of organisms

• mantle
• fossil
• organic material
• Pangea

middle layer of Earth situated between the crust above and the core below

• mantle
• crust
• lithosphere
• outter core

ancient supercontinent, composed of land that forms today’s continents

• Pangea
• Gondwana
• Laurasia
• Hesse

event in which the magnetic field reverses direction

• magnetic reversal
• polarity
• continental drift
• seafloor spreading

mountain range located on the seafloor in the middle of the ocean

• mid-ocean ridge
• trench
• mantle
• Pangea

today’s magnetic field; magnets orient themselves to point north

• normal polarity
• reversed polarity
• seafloor spreading
• continental drift

new oceanic crust forms at a mid-ocean ridge as old oceanic crust moves away

• seafloor spreading
• mantle
• subduction
• magnetic reversal

circulation of material caused by differences in temperature and density

• convection
• divergent
• subduction
• plastic

where two plates collide

• convergent plate boundary
• divergent plate boundary
• lithosphere
• transform plate boundary