Amixture that appears to contain only one substance is a(n)
homogeneous mixture
heterogeneous mixture
compound
element

Mixtures that seem to contain only one substance are homogeneous mixtures. You can figure this out because an element or compound aren’t mixtures. And the prefix “homo” means same while the prefix “hetero” means different. So homogeneous is a mixture that looks the same. Hope this helps, have a good day :)

When seismic waves hit a fault, the waves are reflected off the fault. seismograph can detect these reflected seismic waves. geologists then use these data to map the fault's length and depth

Amagnetic field "does not" interact with stationary electric charges. so, a.hope my answer you : )