Start of Habsburg control of Europe by Charles V of France.  Cortes begins conquest of Mexico, destroying Aztec civilization.

1522 Magellan circumnavigates the world.

High altitude area of land, unbroken by mountain ranges.

Gland at the base of the brain controlling melatonin levels.

  The continuation of the existing social order.

Discharge of an electric field from a cloud.

Sub-Saharan Africa: Xhosa and Zulu.

1.    The amount of energy in the universe is fixed.  It cannot be created or destroyed only changed from one state to another.

A plain built up from the deposition of water borne sediment. See flood plain.

An upward fold in the crust. See syncline.