Answer:
i think a, c and d make no sense whatsoever so its either a or b
Answer:
Scientists use waves to study the different layers of the earth. Usually, they use seismic waves, which are waves generated by earthquakes or nuclear-test explosions. The seismic waves are bent, sped up, or slowed down, or even reflected when they pass through the earth's layers.
Seismic waves are recorded by a machine called a seismograph, which tells us about the strength and speed of the seismic waves. ... Seismic waves travel at different speeds when they pass through different types of material, so by studying seismograms, scientists can learn a lot about Earth's internal structure.
Explanation:
Does this help??
One we have to make time to do something which we can use simple machines
Two we have to be creative in order to finish the task
In this day and age? Not much.
Polytheism however was very significant thousands of years ago, and still makes for a great study.