Final answer:
The approximate percentage of Nitrogen in Earth's atmosphere is 78%, making it the most abundant gas present. Therefore, correct option is 4.
Step-by-step explanation:
The approximate percentage of Nitrogen in the atmosphere is approximately 78%. Our atmosphere is composed mainly of Nitrogen (N₂) and Oxygen (O₂), with Nitrogen making up the larger portion.
The atmosphere at Earth's surface consists of about 78% nitrogen by volume, making it the most abundant gas present.
Nitrogen is vital for life on Earth as it is a component of proteins and the genetic material of all plants and animals. It cycles through different forms in the nitrogen cycle, which moves nitrogen through the abiotic and biotic parts of ecosystems.
Additionally, nitrogen is obtained through the fractional distillation of liquid air, which confirms its abundance in our atmosphere.