Explanation:

All of the above

"The thickness of oceanic crust is less than the thickness of continental crust." - This statement is correct. Oceanic crust is generally thinner and denser than continental crust.

"The asthenosphere is also known as the low-velocity zone of the mantle." - This statement is correct. The asthenosphere is characterized by its relatively low seismic wave velocities, making it the low-velocity zone of the upper mantle.

"The outer core is in a liquid state while the inner core is in a solid state." - This statement is correct. The outer core of the Earth is composed of liquid iron and nickel, while the inner core is solid due to higher pressure despite high temperatures.

Therefore, all three statements are correct