Question

D. State whether the following statements are true or false.
1. Troposphere is the lowest layer of atmosphere.
2. Water is made up of two atoms of hydrogen and one atom of oxygen
3. Air exerts pressure in all directions
4. Nitrogen can convert to oxygen in the process of photosynthesis.​

Answer 1

$\rightarrow \: \huge{ \bold{ \red{true}}}$

The troposphere is the lowest layer of Earth's atmosphere. Most of the mass (about 75-80%) of the atmosphere is in the troposphere. Most types of clouds are found in the troposphere, and almost all weather occurs within this layer

$\rightarrow \: \huge{ \bold{ \red{true}}}$

Water is made up of two hydrogen (H) atoms and one oxygen (O) atom. The formula for water is H2O. The hydrogen atoms have filled orbitals with two electrons and the oxygen atom is filled with eight electrons.

$\rightarrow \: \huge{ \bold{ \red{true}}}$

Air pressure is exerted in all directions because air molecules move in all directions. If you hold your hand out, palm up, the force of air pushing down on your hand is greater than your own weight.

$\rightarrow \:\huge { \bold{ \red{false}}}$

Liquid nitrogen also presents hazards due to its extremely low temperature and large expansion ratio. Nitrogen can displace oxygen in the air, reducing the percentage of oxygen to below safe levels