WHICH TYPE OF BONE GROWTH IS RESPONSIBLE FOR INCREASE IN BONE DIAMETER?   

If 75% of 238U has decayed to 206Pb, how many half-lives have passed?

After the supernova blast of a high-mass star, a __________ remains, which is so dense that a cubic centimeter weighs about 100 billion kg (100 million tons).

  MATCH THE FOLLOWING     

Which of the following planets has rings that can be seen from the Earth?

The absolute magnitude of each star is given in parentheses after its name. Altair (2.3), Capella (0.4), Pollux (0.7), Rigel (–8.1) Which of the stars gives off more energy?

A white dwarf is a very __________ star that glows white because of its __________ surface temperature.

In an undisturbed sequence of sedimentary rocks, younger layers overlie older layers, according to the principle of

Sedimentary rocks overlie a basement of older intrusive igneous or metamorphic rocks in a(n)

Astronomers use a(n) __________ to analyze a star’s electromagnetic radiation and to distinguish various star types.