Entropy.
No matter what natural or man made disasters occur there will always be nature, perhaps not as we know it but it will still be nature.
The eventual running down of the universe is the only thing that will truly destroy nature and even when that happens it is a natural phenomena, so that is nature too.
A shift in the ocean floor might cause a tsunami.
recycling
scientific law
No type of magnetic mineral found in nature is properly called "platinum" by a chemist, because platinum is a chemical element and is not magnetic! The most common magnetic mineral found in nature is called "magnetite". It contains both iron (II) and iron (III) oxides in nearly constant proportions.
focus of the conversion
An Octopus...
Demosthenes
posed a clear danger to the country.
A posed picture can be referred to as non-candid, or a portrait.
They are called conditions.
As we grow, we usually learn what is safe and what isn't. Sadly, at times we see the danger when it's too late. It is human nature to push the barriers. If we avoided all danger, maybe there would be no cars, aircraft and ships etc, in fact nothing that posed a threat.
Question as posed makes no sense. Free? In nature? If so, no.
Candid
Candid
Yes, there are dangers posed by the atmosphere. All forms of weather, including storms, are atmospheric phenomena.
The danger posed by the sirens is primarily physical, as they attract sailors with their enchanting voices to shipwreck on the rocks. The danger posed by the lotus-eaters is more psychological, as they tempt sailors to forget their original goal and become complacent with a sedentary lifestyle. Both threats delay the sailors from reaching their destination, but in different ways.
Kristi was likely not scared of the soldiers in "Number the Stars" because she was young and did not fully comprehend the danger they posed. Additionally, Kristi's innocent and carefree nature may have shielded her from feeling fear in such a threatening situation.