An aurora, sometimes referred to as polar lights, northern lights (aurora borealis) or southern lights (aurora australis), is a natural light display in the Earth’s sky, predominantly seen in the high latitude regions (around the Arctic and Antarctic).
Auroras are produced when the magnetosphere is sufficiently disturbed by the solar wind. It usually occur in upper atmosphere (thermosphere/exosphere) due to Earth’s magnetic field.

Both 1 and 2 are correct.
The Siberian climate is conspicuously absent in the Southern Hemisphere because of the narrowness of the Southern Hemisphere in the high latitudes.
The strong oceanic influence reduces the severity of the winter and coniferous forests are found only on the mountainous uplands of Southern Chile, New Zealand, Tasmania and SE Australia.

Both 1 and 2 are correct.
Despite such a large geographical spread, the Himalayan region seems poor in mineral resources. The rugged terrain and adverse climatic conditions definitely make exploration of minerals difficult and costly. Also, in Himalayas, geological processes have led to major displacement of rock strata. This has disturbed the arrangement of rocks and made it complex, making Himalayas poor in mineral resources. However, some regions
are rich in deposits.

1 and 2 are correct.
A river course goes over several phases of development or maturity. Each phase affects its major characteristics. The characteristics of each of the stages of landscapes developing in running water regimes may be summarised
as follows:
Youth stage
• Few streams that with poor integration flowing through original slopes
• Shallow V-shaped valleys; deep gradients
• Stream divides are broad with marshes, swamps etc.
• Waterfalls and rapids may exist where hard rocks are there
Mature stage
• Plenty streams with good integration; mild gradients
• Deep V-shaped valleys
• Broader meandering floodplains
• Water divides turn sharper
• Waterfalls and rapids disappear
Old Stage
• Smaller tributaries flowing over gentle gradients
• Divides are broad and flat with lakes
• Streams meander freely forming natural leeves, ox-bow lakes
• Most of the landscape is either at or above sea level.

Only 1 is correct.
Cyclones are sustained by very strong low-pressure areas at their core. Winds in surrounding areas are forced to rush towards these low-pressure areas.
Though cyclones are common in the June, very few of them originate in the Arabian Sea. Most of them are found in the Bay of Bengal. In the last 120 years for which records are available, just about 14% of all cyclonic storms, and 23% of severe cyclones, around India have occurred in the Arabian Sea. Arabian Sea cyclones are also
relatively weak compared to those emerging in the Bay of Bengal.