what is the mass of co2 in the atmosphere today (use concentration = 400 ppm)? what is the mass of methane (ch4 concentration = 1.9 ppm)?

Match term definition ellipse a) diagonal cross section of a cylinder circle b) diagonal cross section through the widest part of a sphere sphere c) cross section parallel to the base of a cone great circle d) shape created when a semi-circle is rotated around the y-axis triangle e) perpendicular cross section of a cone

The continuous release of nuclear energy caused when one fission reaction triggered more nuclear reactions is a

Aradio signal from a gps satellite take only about 0.067 seconds to reach a gps reciever. if the speed of light is about 300,000km/s, then approximately how far away is the reciever from from the satellite?