Explanation

A microscope is a laboratory instrument used to examine objects that are too small to be seen by the naked eye. 

Explanation

Infrared light is electromagnetic radiation with wavelengths longer than those of visible light.

Explanation

 GM organisms means Genetically Modified Organisms.

Explanation

DNA replication is the process by which DNA makes a copy of itself during cell division

Explanation

Sound wave is a mechanical  wave.

Explanation

Sphere

Solve for surface area

A=4πr2

r Radius

Explanation

Metamorphic rocks are rocks formed from existing rocks whose mineralogy, chemistry, and texture  have  changed due to heat and pressure in the depths of the Earth's crust.

Explanation

Iron oxide is a chemical compound  of oxygen and iron and is most commonly found in the earth's crust in the

form of hematite (Fe2O3). It also exists in the form of

magnetite (Fe3O4).

Explanation

The salt content in seawater is mainly due to the presence of sodium chloride i.e sodium and chlorine. The abundant element in  seawater is chloride, which accounts for 1.94% of  the total composition. 

 Chloride is followed by 1.08% sodium, 0.04% potassium  and a small amount of iodine.

Explanation

The Earth's South Magnetic Pole is geographically north, and the Earth's magnetic North Pole is geographically south, so free-moving magnets are always north-south.