Questions

Any object rolls when there is no friction. So, Sliding to Rolling is correct.

It takes 248 yrs for Pluto to orbit the Sun.

Metamorphism is the change of minerals or geologic texture in pre-existing rocks, without the protolith melting into liquid magma. The change occurs primarily due to heat, pressure, and the introduction of chemically active fluids.

The parent rock must be in solid form. Tons of pressure must be applied for metamorphism to happen. The process must take place underground.

DNA is copied during a process called Transcription. It is the first step of gene expression, in which a particular segment of DNA is copied into RNA by the enzyme RNA polymerase.

W is the symbol for chemical element Tungsten or Wolfram.

It is used in making filaments of bulbs.