The Elements: Oxygen

Oxygen is a vital element for life, making up a significant part of the human body and being essential for respiration in plants and animals. It is odorless, tasteless, and colorless as a gas, and pale blue as a liquid. Fish utilize dissolved oxygen in water. Industrially, oxygen is used in welding, and medically, it treats conditions like pneumonia. It is the most abundant element in the Earth's crust.

What is the color of oxygen when it is in liquid form?

• Red

• Green

• Pale blue

• Colorless

How do fish obtain the oxygen they need for survival?

• By absorbing it through scales

• Through their gills

• By swallowing air

• Through their skin

Which of the following is a medical use of oxygen?

• Fueling vehicles

• Building structures

• Cooking food

• Treating pneumonia

What is the most abundant element in the Earth's crust?

• Oxygen

• Iron

• Carbon

• Silicon

In which industrial process is oxygen commonly used?

• Food packaging

• Painting

• Welding

• Textile manufacturing