Five examples of internal and external layers of the structure of the earth {5marks}

5 examples of internal structure of the earth are:

1) Crust.

2) Upper Mantle.

3) Lower Mantle.

4) Outer Core.

5) Inner Core.

5 examples of external structures of the earth are:

1) Exosphere.

2) Thermosphere.

3) Mesosphere.

4) Stratosphere.

5) Troposphere.

81 is a composite number.