Unit 4: Earth Systems and Resources

Earth's outer shell, broken into massive, rigid ______.

The semi-fluid layer beneath the lithosphere where ______ currents occur.

Plate boundaries where plates are ______ apart, forming new crust, mid-ocean ridges, and rift valleys.

Plate boundaries where plates are ______ together, leading to subduction, trenches, and volcanic or non-volcanic mountains.

When a denser oceanic plate slides ______ a continental plate at a convergent boundary.