Question

4 why dont scientists know more about earths core and how it works?

Explanation:

Earth's core is extremely deep. Drilling to reach it is currently impossible. Scientists rely on indirect evidence like seismic waves. Seismic waves' behavior gives some clues but not a complete picture. Also, extreme conditions (high pressure, high temperature) in the core make direct study difficult.

Answer:

Scientists don't know more about Earth's core and how it works because it is extremely deep (about 2900 - 5150 km from the surface for the outer core and 5150 - 6371 km for the inner core), making direct drilling impossible. They have to rely on indirect evidence such as seismic waves (which change speed and direction when passing through different materials in the core, but this only gives limited information) and theoretical models. Additionally, the core has extreme conditions (temperatures up to thousands of degrees Celsius and pressures millions of times that at the surface), which are hard to replicate and study in a laboratory - like setting for a full understanding.