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every 10 years.
Gerrymandering occurs when a congressional district's boundaries are redrawn to give one party a clear advantage over another. In the US, redistricting occurs after the results of the Census are tabulated. Redistricting is currently (2012) occurring in the US. Because in most states a state's legislature gets to decide on the redistricting plan, the party currently in power often attempts to give themselves an advantage in future elections by gerrymandering.
Congressional reapportionment occurs when a state gains or loses an electoral vote. Redistricting occurs when the new district is created or a former district is absorbed.
districts must be equally populated. lines must be contiguous or connected. redistricting cannot dilute minority voting strength. district lines cannot be drawn solely based upon race. districts must be compact. communities of interest must be protected.
earthquaskes
Convergent,Divergent, and Transform Boundaries
an earthoquake occurs
I cant
Tectonic plates divide
Normal
Divergent boundaries.
Slub pull.
Plate boundaries