By some estimates, the annual average extent of Northern Hemisphere sea ice has since the 1950s.

Idon't know. the question you are trying to ask doesn't make sense.

Answer islamic scholars made advancements in technology, literature, philosophy, mathematics, astronomy, and the arts during this time period;

Nestor foreshadows the plan of the suitors to kill telemachus through his account of what happened to agamemnon who was murdered by people around him. despite this telemachus was reassured that his voyage was going to be safe with the of athena.