Question

Which boundary marks a change from 100% solid to 100% liquid?

Answer 1

The friction across the surface of the fault holds the rocks together so they do not slip immediately when pushed sideways. Eventually enough stress builds up and the rocks slip suddenly, releasing energy in waves that travel through the rock to cause the shaking that we feel during an earthquake

Answer 2

The mantle outer core marks a change from 100% solid to 100% liquid.

• Mantle outer core: It is one of the layers of the earth which is liquid and consists of components like Iron, Nickel, etc.
• This layer is extremely hot and is responsible for the earth's magnetic field.
• The temperature of this outer core ranges between 4000°C - 6000°C.
• This is one of the earth's outermost layers another one is the inner core with similar composition and temperature.
• It is just that the inner core is in solid form.