How do earthquakes allow us to model the structure of Earth's core?
What will be an ideal response?
Examining the different seismic waves we find P and S waves are not recorded by all over the planet. There is a blind spot for S waves on the side of Earth opposite the earthquake, and there is a shadow zone part way around the surface from the earthquake. Since we know S waves cannot travel through liquid and P waves can, we conclude the Earth's core is liquid. Since P waves bend when they enter the liquid core, but some travel straight through, it implies there is a solid center to the liquid outer core.
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What do we mean by a protogalactic cloud?
A) a cloud of hydrogen and helium that contracts to become a galaxy B) a term once used historically to refer to any galaxy C) the cloud-like halo that surrounds the disks of spiral galaxies D) a cloud of gas that was once a galaxy
____________________ is the molecule most responsible for the greenhouse effect on Venus and Earth
Fill in the blank(s) with correct word
A photon whose energy is 8.00 × 10^?15 J is scattered off an electron at a 90° angle. What is the wavelength of the scattered wave?
a. 2.73 × 10^?11 m b. 2.25 × 10^?11 m c. 2.50 × 10^?11 m d. 2.40 × 10^?12 m e. 2.48 × 10^?11 m
A strip of fur is rubbed against a hard rubber rod. The rod thereby acquires a negative charge because
A. rubbing caused electrons to move from the fur to the rod. B. friction caused protons to be removed from the rod. C. electrons from the air molecules are transferred to the rod. D. frictional forces create electrons.