Question

4 satellites can do many different things. what is one way they have improved communication systems?
a satellites are used to block all tv signals that travel in straight lines so they do not interfere with other communication systems.
b some satellites are built underwater to make it easier and cheaper for people to communicate when near bodies of water, like the ocean.
c tv signals and long distance phone calls work better now that they travel to satellites facing away from earth, rather than directly towards it.
d tv signals do not get blocked by mountains or tall buildings because they now travel upward, where satellites quickly send them back down to earth.

Explanation:

• Option A: Satellites are not used to block TV signals; they are used to transmit them, so this is incorrect.
• Option B: Satellites are not built underwater; they orbit Earth, so this is incorrect.
• Option C: Satellites used for communication face towards Earth (to receive and transmit signals), not away, so this is incorrect.
• Option D: TV signals can be blocked by obstacles like mountains or tall buildings when traveling directly, but with satellites, signals go up to satellites and then back down, bypassing such obstacles, which improves communication.

Answer:

D. TV signals do not get blocked by mountains or tall buildings because they now travel upward, where satellites quickly send them back down to Earth.