Which techniques can scientists use to determine the characteristics of Earth's layers? Select the two correct answers. conduct experiments about how minerals change under high pressure

study how seismic waves travel through different layers

examine the behavior of minerals at extremely low temperatures

use X-rays to obtain a view of Earth's interior layers

drill deep mines to obtain samples from Earth's mantle and core

Which of the following bonds would be most polar? a. c-i b. c-br c. c-cl d. c-f e. c-o

Which best describes the first law of thermodynamics as compared to the second law of thermodynamics? a. the first law describes how thermal energy is conserved but not the direction it moves. b. the first law describes the direction thermal energy moves but not how it is conserved. c. the first law describes how thermal energy can be created but not how it can be destroyed. d. the first law describes how thermal energy can be destroyed but not how it can be created.

In an old-fashioned amusement park ride, passengers stand inside a 3.0-m-tall, 5.0-m-diameter hollow steel cylinder with their backs against the wall. the cylinder begins to rotate about a vertical axis. then the floor on which the passengers are standing suddenly drops away! if all goes well, the passengers will “stick” to the wall and not slide. clothing has a static coefficient of friction against steel in the range 0.60 to 1.0 and a kinetic coefficient in the range 0.40 to 0.70. part a what is the minimum rotational frequency, in rpm, for which the ride is safe? express your answer using two significant figures. f f = rpm