Solution:
North Atlantic warm currents flow in this region the ports of Baltic sea opened for trade in winter. Extended Gulf stream current above 40N latitude in Atlantic is termed as North Atlantic Drift, a warm water current, flowing from tropics towards pole affecting climate of near by coastal regions. Hence, sea ports in West Europe between 50N - 60N Latitude remain open in winters also.

Solution:
Limpopo flows through Mozambique. After Zambezi,it is 2nd largest African river to fall in the Indian Ocean. The Limpopo River in Africa crosses the Tropic of Capricorn twice.The Tropic of Capricorn is located south of the Equator.

Solution:
Temperature of surface water is comparatively higher in the northern hemisphere than in the southern hemisphere. The temperature of ocean water varies in the northern and the southern hemispheres because of dominance of land in the former and water in the latter. The oceans in the northern hemisphere receive more heat due to their contact with larger extent of land than their counter­parts in the southern hemisphere and thus the tempera­ture of surface water is comparatively higher in the former than the latter.

Solution:
A steep sided canyon is formed by the river Colorado in the State of Arizona in U.S.A. The Colorado River in the Grand Canyon faces a battery of threats, each with a critical decision point.

Solution:
The world's highest waterfall is in Venezuela. Angel Falls (Salto Ángel) in Venezuela is the highest waterfall in the world. The falls are 3230 feet in height, with an uninterrupted drop of 2647 feet.

Solution:
The Volga River is the longest river in Europe. Its basin lies entirely within the Russian federation. It is often called Mother Volga by the Russians.

Solution:
Ring of Fire is found commonly in Pacific Ocean. The Ring of Fire is a ring of volcanoes around the Pacific Ocean that result from subduction of oceanic plates beneath lighter continental plates.