Why to astronauts appear weightless while they are filmed performing activities inside the orbiting space shuttle?

they are high enough above the earth’s surface that they have escaped the pull of earth’s gravity.

the space shuttle has anti-gravity devices on it that allow the astronauts to float inside it.

the astronauts are falling at the same rate as the space shuttle as it orbits around earth.

orbiting objects do not experience any gravity.

The astronauts are falling at the same rate as the space shuttle as it orbits around earth

The astronauts seem to float because they are in free fall just like the spacecraft.

However, although they are constantly falling on the Earth, they do not fall because the ship orbits at a sufficient speed (in the same direction of rotation of the Earth) so that the centrifugal force is balanced with the Earth's gravitational pull.

In other words:

The spaccraft and the astronauts are in free fall but the Earth's surface will never be reached as long as they does not decrease the speed.

Then, as they accelerate toward Earth (regardless of their mass), it curves beneath them and never comes close.

That's why astronauts, having the same acceleration as the spacecraft, feel weightless and see themselves floating.

Jet streams are relatively narrow bands of strong wind in the upper levels of the atmosphere. the winds blow from west to east in jet streams but the flow often shifts to the north and south. jet streams follow the boundaries between hot and cold air. the earth's rotation is responsible for the jet stream as well.

The characteristics of groundwater is said to be: are weak turbiditya constant temperaturechemical composition and almost overall absence of oxygen.