Geologists apply various methods to study the layers of the Earth. Which of the following is a method used to study the Earth's layers? ООО
O Scientists use seismic waves to map the atmospheric conditions above Earth's crust.
Scientists map seismic waves to determine the atomic structure of materials that lie beneath Earth's surface.
Scientists measure vibrations of Earth's surface using a compass (an instrument that is sensitive to Earth's magnetic field).
o Scientists measure the time it takes for seismic waves to reach a seismograph (an instrument that measures seismic waves).

Consider an ordinary, helium-filled party balloon with a volume of 2.2 ft3. the lifting force on the balloon due to the outside air is the net resultant of the pressure distribution exerted on the exterior surface of the balloon. using this fact, we can derive archimedes’ principle, namely that the upward force on the balloon is equal to the weight of the air displaced by the balloon. assuming that the balloon is at sea level, where the air density is 0.002377 slug/ft3, calculate the maximum weight that can be lifted by the balloon. note: the molecular weight of air is 28.8 and that of helium is 4.

Acar drives toward the right over the top of a hill, as shown below. which arrow represents the centripetal acceleration? w x y z

Afrequency generator sends a 550 hz sound wave through both water and ice. what is the difference in wavelength between the wave produced in ice and the wave produced in water?