Which set of coordinates most accurately locates the boundary between the Jurassic mudstones and the Cretaceous shales and sandstones? Location 1: 39.701200 degree, -105.201430 degree
Location 2: 39.701072 degree, -105.201621 degree
Location 3: 39.700935 degree, -105.201790 degree
Location 4: 39.700575 degree, -105.202275 degree

Awave has a wavelength of 7 mm and a frequency of 19 hertz. what is its speed?

You have two photos of a person walking. one shows the person at the corner of third and main streets, the other shows the person at the corner of tenth and main streets. there are lampposts at every corner in this town, and the first picture shows it to be 10: 32: 00 exactly. the second picture shows it to be 10: 49: 30. you know three facts: (1) all of the clocks are synchronized; (2) there are exactly 12 equal-sized blocks per kilometer in this town; and (3) the streets that cross main in this area are numbered consecutively, with no interruptions. what is the person’s average speed in kilometers per hour?

When you see distant streetlights through smog, they look dimmer and redder than they do normally. but when you see the same streetlights through fog or falling snow, they look dimmer but not redder. use your knowledge of the interstellar medium to discuss the relative sizes of the particles in smog, fog, and snowstorms compared to the wavelength of light.