Radio waves heading upward from earth often bounce off the
a. troposphere b. mesosphere
c. stratosphere
d. thermosphere

In an experiment, how can i change human errors? be specific.

What property of an object determines its inertia?

"if the pressure acting on an ideal gas at constant temperature is tripled, its volume isa) reduced to one-third.b) increased by a factor of three.c) increased by a factor of two.d) reduced to one-half"