General Science Questions

Any undesirable change in physical, chemical or biological characteristics of air, land, water or soil is called?

First human who got married in space is

Sandstone is which type of rock?

_______ determines colour, texture, chemical properties, mineral content and permeability of soil.

The method of soil conservation in which stones, grass, soil are used to build barriers along contours and trenches are made in front of the barriers to collect water is called?

The warm and cold ocean currents are caused by

1 km/hr equals _____________ m/s

The outermost layer of sun is called