The H-R diagram is a comparison between: O A star's size and distance from the Sun
O Astar's static levels and its brightness
O Astar's life span and its size
O Astar's absolute magnitude and temperature

the correct answer is amazon river

explanation:

since the crust is readily accessible, scientists have been able to perform hands-on experiments to determine its composition; studies on the more distant mantle and core have limited opportunities samples. so scientists also rely on analyses of seismic waves and gravity and as well as magnetic studies.