The answer is A
Explanation:
Vacuuming doesn’t involve a lot of physical movements.
Dr. Inge discovered the make up of the earths inner core by studying how an earthquakes waves bounced off the core. And Inge Lehmann was studying the waves of a 1929 earthquake when she found them acting inconsistently with solid mantle crust
hope it helps you
Light from other stars take longer to reach the earth because they are farther than our sun.
