The geographic boundary covered by a Wi-Fi (802.11) wireless access point. Typically set up for Internet access, anyone entering the hotspot with a Wi-Fi-based laptop, smartphone or tablet can ...

"What we've now found is that these ultra-low velocity zones do not just exist beneath the hotspots. They're spread out all across the core-mantle boundary beneath North America," Thorne said.

but are located more than 3,200 kilometres from the nearest plate boundary. This is explained by the 'hotspot' theory. Key fact The 'hotspot' theory is that there are fixed spots in the mantle ...