Explanation

• The percentage of Oxygen in the air is: 21.94%
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• The air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen.
  
• Air also has small amounts lots of other gases, too, such as carbon dioxide, neon, and hydrogen.
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• Without oxygen, brain damage is likely after 04-05 mins.
• Joseph Priestly discovered oxygen on August 1, 1774.
• The most abundant element in the Earth's crust is oxygen, making up 46.6% of Earth's mass

Explanation

• Copper is a chemical element with the symbol Cu and atomic number 29. 
• It is a soft, malleable, and ductile metal with a reddish-orange color.

The some major elements with their symbols:

• Hydrogen - H
• Sodium - Na
• Carbon - C
• Nitrogen - N
• Oxygen - O
• Fluorine - F
• Chlorine - Cl
• Potassium - K
• Helium - He
• Neon - Ne
• Calcium - Ca
• Sulphur - S
• Phosphorus - P
• Aluminium - Al
• Magnesium - Mg
• Iron - Fe

Explanation

• The speed of sound in air at 0°C (32°F) is 332 meters per second.

The speed of sound in different materials:

• Air: 332 m/s
• Sea water: 1530 m/s
• Lead: 2160 m/s
• Gold: 3240 m/s
• Brick: 3650 m/s
• Copper: 4760 m/s
• Glass: 5100 m/s
• Aluminium: 6420 m/s

Explanation

• Air is a mixture of different gases.
• Primarily consisting of nitrogen (78%), oxygen (21%), and trace amounts of other gases.

Explanation

• GPS stands for Global Positioning System, a network of satellites orbiting the Earth.
• It provide location information and timing signals to GPS receivers on the ground.

Explanation

Mitochondria is known as powerhouse of cell because it serves as site for synthesis of Adenosine Triphosphate (ATP),

the energy currency of cell, through the process of aerobic cellular respiration.

ATP serves as energy currency for different cell activities.

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A cell consists of three parts:

1.      The cell membrane,

2.      The nucleus, and,

3.      Between the two, the cytoplasm.

Explanation

• An atom is the smallest particle of an element that retains the properties of that element.
• It is the smallest unit of a chemical element, and it cannot be broken down into smaller particles.

Explanation

• Meteoroids are small particles from space that enter the Earth's atmosphere.
• It producing a bright streak of light, commonly known as a shooting star or meteor.
• If a meteoroid survives its passage through the atmosphere and lands on Earth, it is called a meteorite.

Explanation

• Navigation satellites, such as GPS (Global Positioning System), GLONASS, and Galileo.
• They are used to provide location information and precision timing signals to GPS receivers on the ground.
• It allowing for precise navigation and tracking of vehicles, ships, and aircraft.

Explanation

• GPS (Global Positioning System) is used for identifying the location of objects on Earth.
• GPS provides accurate positioning and timing information, enabling users to determine their precise location anywhere on Earth.