The answer is the first one because it’s a compound of two words separate when you say it :) hope this helps !
<span>A fast moving stream of air has a lower air pressure than a
slower air stream. As the stream of air moved over the
top of the paper, the air pressure over the paper dropped. The
air pressure underneath the paper stayed the same. The
greater air pressure underneath lifted the paper strip and it
rose. The idea that a moving air stream has lower air pressure
than air that is not moving is called “Bernoulli’s Principle”.
</span>The
force of the moving air underneath the balloon was enough to
hold it up. The weight added by the paper clip prevents
the balloon from going too high. But that is only part
of the story. The balloon stays inside the moving stream
of air because the pressure inside is the air stream is lower
than the still air around it. As the balloon moves toward the
still air outside of the air stream, the higher pressure of
the still air forces the balloon back into the lower pressure
of the air stream. Bernoulli’s Principle at work again!
Fills volume of the container.
Why? Because the gas particles have a very weak force of attraction so they move very freely and so they always fill the volume of containers.
The answer is : Magma with low viscosity. It makes for a weak volcanic eruption. <span>If the </span>viscosity<span> is </span>low (thin)<span>, non-explosive eruptions usually begin with fire fountains due to release of dissolved gases. When </span>magma<span> reaches the surface of the earth, it is called lava. </span>
