The Northeast monsoon derives its name from the direction in which it travels — from the northeast to the southwest.
Similarly, the summer monsoon moves in exactly the opposite direction — from the southwest to the northeast. That is why it is called the southwest monsoon.
Many other parts of the country, like the Gangetic plains and northern states, also receive some rain in November and December but this is not due to the northeast monsoon.
It is caused mainly by the Western Disturbances, an eastward-moving rain-bearing wind system that originates beyond Afghanistan and Iran, picking up moisture from as far as the Mediterranean Sea, even the Atlantic Ocean.

A complex volcano, also called a compound volcano, is defined as one that consists of a complex of two or more vents, or a volcano that has an associated volcanic dome, either in its crater or on its flanks.

North Atlantic Drift is a warm current.

Anticyclone is a region where the atmospheric pressure is high compared with that of adjacent areas. In the northern hemisphere the general wind circulation is clockwise round the anticyclone, while in the southern hemisphere it is anticlockwise. The extents are generally large and the effects are also pronounced.

Tropical rain forests experience heavy rainfall and the rain washes away the nutrients in top layer. In coniferous forests, due to low temperature microbial activity is low and sesqui-oxides released by leaves by trees keep the soil acidic and poor in nutrients.