Based on your knowledge of seismic waves as well as the composition and density of each layer within the earth , identify the waves found in location B and describe their behaviors ( A) S waves are stopped by the liquid outer core and then reflected back up to earth’s surface so only p waves are found at location B. (B) Location B, the core, contains P and S waves . The waves are curves or refracted as wave velocity changes with a change in the density of the layers . (C) Location B, the core , contains only S waves . Due to the reflection of P waves off the boundary of the core , there are nine present at B. S waves are refracted rather than reflected (D) Location B, the core , contains only P waves . P waves travel through both solid and liquids layers but they are refracted as wave velocity changes with a change in the density of the layers

i'm pretty sure it is letter c.) car

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

most historians agree that gabriel mouton, the vicar of st. paul’s church in lyons, france, is the “founding father” of the metric system. he proposed a decimal system of measurement in 1670. mouton based it on the length of one minute of arc of a great circle of the earth (now called a nautical mile, 1852 meters). he also proposed the swing-length of a pendulum with a frequency of one beat per second as the unit of length (about 25 cm). a pendulum beating with this length would have been fairly easy to produce, thus facilitating the widespread distribution of uniform standards. over the years, his work was revised, improved, and extended by a number of french scientists.

the political sponsor of weights and measures reform in the french revolutionary national assembly was the bishop of autun, better known as talleyrand. under his auspices, the french academy appointed several committees to carry out the work of developing a usable system of weights and measures for france. one of the committees recommended a decimalized measurement system based upon a length equal to one ten-millionth of the length of a quadrant of the earth’s meridian (i.e., one ten-millionth of the distance between the equator and the north pole).