Tectonics vocab #1-10

Folded mountain ranges & ocean trenches are common along a _____________ boundary where two plates are coming together.

• transform
• divergent
• strike-slip
• convergent

Iceland is growing larger every day because the mid-ocean ridge, which is a __________________ boundary that is spreading apart, runs through the center of it

• transform
• divergent
• subduction zone
• convergent

Harry Hess proposed this theory, called _______________________, in the 1960’s to explain the formation of underwater mountain ranges called mid-ocean ridges.

• Plate tectonics
• Continental drift
• Pangaea
• Seafloor spreading

Tectonic plates move around on this very thick lower, plastic-like layer of the mantle much like a raft floats on top of water.  This layer (#2) is the _______________________.

• core
• lithosphere
• asthenosphere
• crust

The outermost layer of Earth’s plates (#1) that is about 100 km thick & made up of oceanic crust, continental crust, & the rigid upper mantle is called _______________________.

• core
• lithosphere
• asthenosphere
• crust

The very hot, dense center of our planet (#3)- the inner part is made of solid iron & the outer part is liquid metal- is called the ____________.

• core
• lithosphere
• asthenosphere
• crust

Sections of Earth’s crust & upper mantle, called ______________, float & move along like rafts on top of a plastic-like layer of Earth.

• core
• crust
• mantle
• plates

According to the theory of _____________________, which combines findings from two previous theories; Earth’s crust & upper mantle are broken into sections that float along on a plastic-like layer of the mantle.

• Pangaea
• Seafloor spreading
• Plate tectonics
• Continental drift

____________ means “all land” and is the name given to the supercontinent Wegener believes began splitting apart about 200 million years ago.

• Continental drift
• Pangaea
• Seafloor spreading
• Plate tectonics

The edges of some continents look as if they can fit together like a puzzle.  Alfred Wegener proposed a hypothesis, called __________________________, to explain that all continents were once joined as one large land mass, and slowly moved to their current positions.

• Continental drift
• Plates
• Seafloor spreading
• Plate tectonics