Question

what tool has allowed scientists to learn about the characteristics of earths layers? (1 point)
satellite
x - ray
radar
seismograph

Explanation:

Seismographs record seismic waves which travel through Earth's layers, revealing information about the layers' characteristics. Satellites are mainly for observing Earth's surface and atmosphere from space, X - rays are used in medical and some material - analysis contexts, and radar is for detecting objects and measuring distances.

Answer:

seismograph