Question

1. what is air pressure?
2. what sphere is split into exosphere and ionosphere?
3. what layer of the atmosphere contains many ions?

label the diagram with the layers of the atmosphere

Explanation:

1. Air pressure is the force exerted by air molecules on a surface due to the weight of the air above it.
2. The thermosphere is split into the exosphere and ionosphere. The exosphere is the out - most layer and the ionosphere is part of the thermosphere where ionization occurs.
3. The ionosphere, which is part of the thermosphere, contains many ions. This is due to the interaction of solar radiation with gas molecules in this layer.

For labeling the diagram (from top to bottom): Exosphere, Thermosphere, Mesosphere, Stratosphere, Troposphere.

Answer:

1. The force exerted by air molecules on a surface due to the weight of the air above it.
2. Thermosphere
3. Ionosphere

Labeling (from top to bottom): Exosphere, Thermosphere, Mesosphere, Stratosphere, Troposphere