Looking for title of movie about life on Venus

Movie I saw in school. From the 1970's or early 80's

Possibly made for TV movie.

Scientist were looking to explore Venus. I may be wrong on that but I believe it was Venus.

They found a way to make it rain there in an effort to terraform the planet.

However after a group landed they found large worm like creatures that were killed by the man made rain.

The scientist had failed to consider life below the soil.

The worms just crumbled in their hands.