Not only does inflowing air affect cave temperature, but it also affects cave humidity. The same study showed that humidity was lower whenever the cave inhaled. Natural cave humidity is probably about 95%-100%. Cold air is usually dry, and when it enters the cave environment and warms it becomes even drier. Some areas showed humidity as low as 60% on days when the cave inhaled. Humidity did not stabilize until the Temple was reached, over 2000 feet into the cave.
If you're planning to travel to Cuba, expect to spend about $45 per day during your trip, according to the travel site Budget Your Trip. Spending a week in Cuba will cost you approximately $315, but with pricey chartered flights averaging $717 per ticket, your grand total will reach an estimated $1,032.
A passport card is valid for travel to and from Canada, Mexico, the Caribbean and Bermuda at land border crossings and sea ports-of-entry. It is not valid for air travel. It is valid for 10 years for adults and 5 years for minors under 16. A first passport book costs $135 for adults and $105 for minors under the age of 16. It costs $110 to renew. A first passport card costs $55 for adults and $40 for minors under the age of 16. It costs $30 to renew. The cost when applying for both is $165 for adults and $120 for minors.