Theories about "earthquake machines" made by governments or secret groups pop up now and then. People point to stuff like HAARP that's supposed to cause quakes. But triggering real earthquakes takes way more energy than we can generate.

Then there's ideas about using technology to control the suns energy hitting Earth - solar radiation management. It gets talked about to maybe fight climate change down the road. But no sign it's being done secretly to change the global temperature today.

The moon landing conspiracy theory doesn't involve natural stuff directly. But some claim NASA faked the 1969 landing, that the videos and photos have weird problems. But the evidence we went is overwhelming, from moon rocks to thousands who worked on Apollo.
Other theories say gravity and a round Earth are hoaxes to control people. That tides, planets moving and such work with a flat Earth. But science has seen Earth is round and gravity is real for ages.
Basically conspiracy ideas pop up to explain stuff people don't fully understand. But the evidence behind mainstream science is super strong after centuries of work.

Heres my attempt at rewriting the paragraph on volcanic eruption theories to sound more human:

So there's these conspiracy ideas out there saying governments are actually causing volcanic eruptions on purpose or covering them up when they happen naturally. These kinds of theories seem to come from not really getting how volcanoes work in the first place and ignoring all the science that explains what makes them erupt.

I think a few reasons these kinds of ideas stick around are:

Some folks just don't trust the government or scientific community much, so they could be more open to thinking natural disasters are being manipulated behind the scenes.

Also, natural disasters are scary and not always easy to wrap your head around and having a straightforward "explanation" even if it's a conspiracy theory can be comforting.

Plus, the internet and social media let these kinds of theories spread super fast making them seem more believable to more people.

And a lot of times conspiracy theories happen because people dont fully get the science behind how natural phenomena actually work, so they come up with alternate ideas instead.

But from all the research out there, scientists pretty much understand why things like weather, earthquakes volcanoes etc happen. The evidence definitely supports natural causes rather than secret plots or coverups.