Timed the helium used to fill birthday balloons doesn’t come out of the air, but fromout of the ground. some of the gas might escape from the ground into theatmosphere, but the majority of it is trapped in earth’s crust. based on whatyou have learned in today’s lab, give a reasonable explanation for thepresence of helium gas in earth’s crust.

Determine the reaction and balance the following equations urgent due in the morning

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.

How to calculate the mass of copper