Questions

When water is cooled from 4°C to 0°C, its density decreases.

When water cools from 4°C to 0°C, ice crystals begin to form because the water is approaching its freezing point. When water freezes, the water molecules form a lattice that increases the volume. As a result, the density decreases. This is why ice will float on top of water; ice has a lower density than the water.

The main source of organic matter in soil is the plant and animal tissue that decompose at each level of breakdown.

The most important determinant of consumer spending is the level of income.

The first electric train of India was opened in 1925. The first electric train ran between Bombay (Victoria Terminus) and Kurla, a distance of 16 km.