The video tutorial explains the concept of 'organic' as it relates to living and once-living things, emphasizing that organic materials contain carbon. It describes how limestone, an organic sedimentary rock, is formed from marine organisms and highlights its uses in construction. The tutorial also covers coal, another organic rock, detailing its formation from ancient plant and animal remains and its role as a fossil fuel for generating electricity.

What does the term 'organic' refer to?

• Only living plants

• Artificially created substances

• Anything that is or was living

• Non-living minerals

What is limestone primarily composed of?

• Clay and silt

• Sand and gravel

• Volcanic ash

• Once-living corals and shells

Which of the following is a use of limestone?

• Producing plastic

• Fuel for cars

• Building large structures

• Making glass

What is coal primarily used for?

• Producing textiles

• Making jewelry

• Generating electricity

• Building materials

How is coal formed?

• By compressing sand

• From the remains of dead plants and animals

• From volcanic eruptions

• Through chemical reactions in the ocean