How big is the earths core

Around 760 miles (1,220 km)

At the center of the Earth is the core. According to NASA, It has two parts; The solid, Inner core which's made up of iron has around 760 miles (1,220 km). It's surrounded by a liquid, outer core composed of a nickel-iron alloy. The outer core is approximately 1,355 miles (2,1801 km) thick

Explanation:

a student using a sling psychrometer measured a wet-bulb temperature of 10°c and a dry-bulb temperature of 16°c. the dewpoint is 6°c. the answer is number 3. the rest of the choices do not answer the question above.