Almost all smartphone devices have global positioning satellite (GPS) service capabilities in them, which mean that apps will be able to combine the phone user's location with the available retail outlets and services to build better mobile business opportunities. For instance, some applications can navigate the user to a particular business locations (such as movie theaters, restaurants, or a nearby auto repair facilities) based on the user's present location.
App like twitter can use the GPS capability to tailor yhier user feeds and timelines with digital contents that are intresting to users in that location.
amazon can advertise based on the need of consumers in a particular location.
Google also tailor thier adword and adsense advert based on the location of the user.
We can assume that the acidity of the river has a pH value of at least 6 or greater. We know this because given that clams die if acidity is less than 6 and frogs die when acidity is less than 4, if they both survive, acidity must not be lower than 6 pH
