There can be many but one at a time.
there are many layers
It is sand. Edit: Over many thousands of years - sediment gets compressed and compacted into layers. The layers form rocks such as slate and coal.
it has 7 layers!!
how many layers does the earth have and name them
There are approximately 1,500 activevolcanoes worldwide
The cantaloupe has 4 layers.
10 layers
2 layers
7 layers
100 layers
Saturn Has Three Layers