Answer:
absolute brightness
Explanation:
The observational fact about a cepheid variable star that leads to a measurement of its distance from earth is that its period of variation is directly related to its absolute brightness
The horizontal rows<span> in the </span>periodic table<span> are periods, while the vertical </span>rows<span> are </span>called<span> groups. </span>
The focus is the place inside Earth's crust where an earthquake originates. The point on the Earth's surface directly above the focus is the epicenter. When energy is released at the focus, seismic waves travel outward from that point in all directions.
Answer:
to reduce the non renewable energy usage.
Ok so the answer will be C
