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

Explain to someone who knows nothing about fossils the study of invertebrate paleontology and how it scientists understand the history of the earth. be sure your explanation contains a minimum of two complete sentences.

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity

This is important 1. what happens to the speed of molecules in water vapor when it condenses to form a liquid? (2 points) the molecules slow down. the molecules speed up. the molecules slow down and then speed up. the molecules speed up and then slow down. 2. how might human activities change to compensate for a decrease in water supplies? (2 points) humans might build a factory. humans might build drainage systems. humans might extract more water from the ground. human behavior does not change because of the water cycle. i'll be grateful if anyone can answer these 2 questions !