Is the Asthenosphere Liquid?

1) The asthenosphere is a layer of semi-molten rock. The temperature is just below the melting point of rock, so it's too hot to be solid like the crust, but still too cool to be liquid.

Is the Earth's asthenosphere a solid or liquid?

The asthenosphere is a solid but it can flow, like toothpaste. The lithosphere rests on the asthenosphere.

Is the asthenosphere the only liquid layer?

This layer of the earth lies between the mantle and the solid inner core. It is the only liquid layer, a sea of mostly iron and nickel about 1,400 miles (2,300 km) thick.