Std.7 sst ch.1 question answer

2 . If the Himalayas did not exist     If the Himalayas did not exist, India would be very different. The cold winds from Central Asia would enter India freely, making the climate much colder and drier. Many rivers like the Ganga, Yamuna, and Brahmaputra might not exist because these rivers originate from the Himalayan glaciers. Without the Himalayas, there would be less rainfall, fewer forests, and farming would become difficult in many regions. The northern plains might even look like deserts. The Himalayas also protect India from strong winds and help in bringing monsoon rains, so life in India would be much harder without them. 3. Why is India called a ‘mini-continent’? India is called a “mini-continent” because it has great diversity in physical features, climate, culture, languages, and natural resources, just like a continent. It has mountains in the north, deserts in the west, plains in the center, plateaus in the south, and coastal regions on both sides. Different par...
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Plasma

 Plasma

Plasma is one of the four fundamental states of matter, and was first described by chemist Irving Langmuir in the 1920s. It consists of a gas of ions – atoms which have some of their orbital electrons removed – and free electrons. Plasma can be artificially generated by heating a neutral gas or subjecting it to a strong electromagnetic field to the point where an ionized gaseous substance becomes increasingly electrically conductive. The resulting charged ions and electrons become influenced by long-range electromagnetic fields, making the plasma dynamics more sensitive to these fields than a neutral gas.

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