Elements in the Earth Crust, Oceans, Human Body and Earth;s Atom

Earth's current atmosphere is _?_.

• 78% nitrogen, 21% oxygen, 0.9% argon and 0.037% carbon dioxide
• 78% oxygen, 21%nitrogen, 0.9% argon, 0.037% carbon dioxide
• 78% nitrogen, 21% argon, 1% oxygen
• 78% oxygen, 21% nitrogen, 1% carbon dioxide

What makes up 99% of the atmosphere?

• nitrogen
• oxygen
• carbon dioxide
• nitrogen and oxygen together

What is the most common gas in the atmosphere?

• nitrogen
• oxygen
• water vapor
• carbon dioxide

Oxygen makes up approximately ____% of the gases in the atmosphere.

• 20
• 40
• 60
• 80

Most of human body is composed of ...

• Hydrogen

• Carbon

• Water

• Calcium

Where in a human body you can't find oxygen?

• carbohydrates

• proteins

• fats

• oxygen can be found everywhere in a human body

Organic compounds are made of carbon

• True

• False

Tags

NGSS.HS-LS1-1

There is no nitrogen in a

• DNA

• proteins

• water

• nucleic acids

Calcium is one of the main building blocks for our

..... and .......

• teeth

• muscles

• skin

• bones

_______________ is the fundamental to all ife

• Silicon

• Carbon

Tags

NGSS.HS-LS1-6

NGSS.HS-LS2-5