The Hot Spot
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You can connect to a Personal Hotspot using Wi-Fi, Bluetooth, or USB. And with iOS 13 or later, devices that are connected to a Personal Hotspot will stay connected, even if the screen is locked, so those devices will still get notifications and messages.
When you connect a device to your Personal Hotspot, the status bar turns blue and shows how many devices have joined. The number of devices that can join your Personal Hotspot at one time depends on your carrier and iPhone model. If other devices have joined your Personal Hotspot using Wi-Fi, you can use only cellular data to connect to the internet from the host device.
On the device that you want to connect, go to Settings > Wi-Fi and look for your iPhone or iPad in the list. Then tap the Wi-Fi network to join. If asked, enter the password for your Personal Hotspot.
To make sure that your iPhone or iPad is discoverable, go to Settings > Bluetooth and stay on that screen. Then on your Mac, follow the manufacturer directions to set up a Bluetooth connection. Learn more about using Personal Hotspot with Bluetooth.
You need to set a Wi-Fi password in order to set up a Personal Hotspot. To change the Wi-Fi password, go to Settings > Cellular > Personal Hotspot or Settings > Personal Hotspot, then tap the Wi-Fi password.*
Choose a Wi-Fi password that's at least eight characters long and use ASCII characters. If you use non-ASCII characters, other devices will be unable to join your Personal Hotspot. Non-ASCII characters include characters in Japanese, Russian, Chinese, and other languages. ASCII characters include:
You can use your phone's mobile data to connect another phone, tablet, or computer to the internet. Sharing a connection this way is called tethering or using a hotspot. Some phones can share Wi-Fi connection by tethering.
The Hawaiian Emperor seamount chain is a well-known example of a large seamount and island chain created by hot-spot volcanism. Each island or submerged seamount in the chain is successively older toward the northwest. Near Hawaii, the age progression from island to island can be used to calculate the motion of the Pacific Oceanic plate toward the northwest. The youngest seamount of the Hawaiian chain is Loihi, which presently is erupting from its summit at a depth of 1000 meters. Image courtesy of U.S. Geological Survey.
The Hawaiian Islands were formed by such a hot spot occurring in the middle of the Pacific Plate. While the hot spot itself is fixed, the plate is moving. So, as the plate moved over the hot spot, the string of islands that make up the Hawaiian Island chain were formed.
Whether you're on your laptop, smartphone or tablet, fraudsters can more easily access your data when you're in a shared Wi-Fi hot spot than they can when you're on a private network at home. Hackers can also use an unsecured Wi-Fi connection to distribute malicious software, better known as malware, and computer viruses.
Another misconception is that a public Wi-Fi hot spot is safe if an establishment gives out a password. In truth, if that password is freely given to anyone, it's not much safer than having no password at all.
In other words, using free public Wi-Fi is not recommended. If you're going to anyway, there are ways to protect your personal data while doing so. But there's another option to consider if you need to go online while you're out and about: using your smartphone's cellular connection by creating a personal hot spot.
While you might not know it, you can turn your smartphone into a Wi-Fi hot spot. Whether you have an iPhone or an Android, many plans will allow you to access the internet on another device, such as a laptop, with your own personal hot spot.
To be clear, a personal hot spot is ideal only when you want to use another device to access the internet. If you're simply using your smartphone to go online, you don't need a personal hot spot. You simply use your data. But for a device like a laptop or tablet, a personal hot spot is a safer way to get online than using public Wi-Fi.
Also, if you're out with a few friends or family members who do not have a data plan and want to get on the internet to check something on their phones or other devices, you can create a personal hot spot and then share the password with everyone. Creating a personal hot spot can be useful even at home if your internet conks out or if you have so many devices competing on your regular Wi-Fi that everything slows down.
On your iPhone, go to Settings Personal Hotspot Family Sharing. Tap to enable it. Now tap the name of each of your family members. You can set whether they need to ask for approval to join your hot spot or allow them to do so automatically.
If your phone is a Samsung, Motorola, LG, Google or any other Android, you can also easily create a personal hot spot. The setup may vary, since phone makers sometimes tweak the way Android looks and operates on their device, but this walk-through should work. If not, do a web search with the name of your phone and how to set up a personal hot spot.
Again, expect some variances between Android devices. For example, to enable the personal hot spot on a Samsung Galaxy phone, you will select Settings Connections Mobile Hotspot Tethering.
Space Shuttle photograph of the Hawaiian Islands, the southernmostpart of the long volcanic trail of the \"Hawaiian hotspot\" (seetext). Kauai is in the lower right corner (edge) and the Big Island of Hawaiiin the upper left corner. Note the curvature of the Earth (top edge). (Photographcourtesy of NASA.)
In 1963, J. Tuzo Wilson, the Canadian geophysicist who discovered transformfaults, came up with an ingenious idea that became known as the \"hotspot\"theory. Wilson noted that in certain locations around the world, such asHawaii, volcanism has been active for very long periods of time. This couldonly happen, he reasoned, if relatively small, long-lasting, and exceptionallyhot regions -- called hotspots -- existed below the plates that wouldprovide localized sources of high heat energy (thermal plumes) tosustain volcanism. Specifically, Wilson hypothesized that the distinctivelinear shape of the Hawaiian Island-Emperor Seamounts chain resulted fromthe Pacific Plate moving over a deep, stationary hotspot in the mantle,located beneath the present-day position of the Island of Hawaii. Heat fromthis hotspot produced a persistent source of magma by partly melting theoverriding Pacific Plate. The magma, which is lighter than the surroundingsolid rock, then rises through the mantle and crust to erupt onto the seafloor,forming an active seamount. Over time, countless eruptions cause the seamountto grow until it finally emerges above sea level to form an island volcano.Wilson suggested that continuing plate movement eventually carries the islandbeyond the hotspot, cutting it off from the magma source, and volcanismceases. As one island volcano becomes extinct, another develops over thehotspot, and the cycle is repeated. This process of volcano growth and death,over many millions of years, has left a long trail of volcanic islands andseamounts across the Pacific Ocean floor.
According to Wilson's hotspot theory, the volcanoes of the Hawaiian chainshould get progressively older and become more eroded the farther they travelbeyond the hotspot. The oldest volcanic rocks on Kauai, the northwesternmostinhabited Hawaiian island, are about 5.5 million years old and are deeplyeroded. By comparison, on the \"Big Island\" of Hawaii -- southeasternmostin the chain and presumably still positioned over the hotspot -- the oldestexposed rocks are less than 0.7 million years old and new volcanic rockis continually being formed.
Although Hawaii is perhaps the best known hotspot, others are thought toexist beneath the oceans and continents. More than a hundred hotspots beneaththe Earth's crust have been active during the past 10 million years. Mostof these are located under plate interiors (for example, the African Plate),but some occur near diverging plate boundaries. Some are concentrated nearthe mid-oceanic ridge system, such as beneath Iceland, the Azores, and theGalapagos Islands.
A few hotspots are thought to exist below the North American Plate. Perhapsthe best known is the hotspot presumed to exist under the continental crustin the region of Yellowstone National Park in northwestern Wyoming. Hereare several calderas (large craters formed by the ground collapseaccompanying explosive volcanism) that were produced by three gigantic eruptionsduring the past two million years, the most recent of which occurred about600,000 years ago. Ash deposits from these powerful eruptions have beenmapped as far away as Iowa, Missouri, Texas, and even northern Mexico. Thethermal energy of the presumed Yellowstone hotspot fuels more than 10,000hot pools and springs, geysers (like Old Faithful), and bubbling mudpots(pools of boiling mud). A large body of magma, capped by a hydrothermalsystem (a zone of pressurized steam and hot water), still exists beneaththe caldera. Recent surveys demonstrate that parts of the Yellowstone regionrise and fall by as much as 1 cm each year, indicating the area is stillgeologically restless. However, these measurable ground movements, whichmost likely reflect hydrothermal pressure changes, do not necessarily signalrenewed volcanic activity in the area.
Authors' Note: Since this booklet's publication in 1996, vigorous scientific debate has ensued regarding volcanism at \"hotspots.\" New studies suggest that hotspots are neither deep phenomena nor \"fixed\" in position over geologic time, as assumed in the popular plume model. See \"
A hot spot is a location on an airport movement area with a history or potential risk of collision or runway incursion, and where heightened attention by pilots and drivers is necessary.
The FAA is taking several proactive steps to address wrong surface events, reduce the potential for runway confusion and help improve safety in the National A