What shape is the Earth?, The Earth is an enormous sphere., What is the radius of the Earth?, About 6,400 km., What are the four spheres of the Earth?, The geosphere, hydrosphere, atmosphere and biosphere., What is the geosphere?, The rocky part of the Earth., What are the layers of the geosphere?, The crust, mantle and core., What is the crust?, The outermost layer where life exists., How thick is the crust?, About 50 km thick., What is the mantle?, The layer below the crust., What is special about the mantle?, It is very hot and contains magma., What is the core like?, It is the innermost layer and very hot., What is the atmosphere?, The layer of gases that surrounds the Earth., What is the hydrosphere?, All the water on Earth., What is the biosphere?, All living things and the places where they live., What causes changes in the Earth’s surface?, The Earth’s internal energy., Give one example of landforms created by internal energy., Volcanoes or mountains.

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