Which of these is a feature of most shield volcanoes? A. violent eruptions

B. thick lava

C. broad base

D. steep sides

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant

The air that we breath is made mostly of which gaseous molecule

The two stars in a certain binary star system move in circular orbits. the first star, alpha, has an orbital speed of 36 km/s. the second star, beta, has an orbital speed of 12 km/s. the orbital period is 137 d. a) what is the mass of the star alpha? b) what is the mass of the star beta?