A pebble is a clast of rock with a particle size of 2 to 64 millimetres based on the Krumbein phi scale of sedimentology. Pebbles are generally considered larger than granules (2 to 4 millimetres diameter) and smaller than cobbles (64 to 256 millimetres diameter). A rock made predominantly of pebbles is termed a conglomerate. Pebble tools are among the earliest known man-made artifacts, dating from the Palaeolithic period of human history.
A beach composed chiefly of surface pebbles is commonly termed a shingle beach. This type of beach has armoring characteristics with respect to wave erosion, as well as ecological niches that provide habitat for animals and plants.
Inshore banks of shingle (large quantities of pebbles) exist in some locations, such as the entrance to the River Ore, where the moving banks of shingle give notable navigational challenges.
Pebbles come in various colors and textures, and can have streaks of quartz and different colored sedimentary rock. Pebbles are mostly smooth but, dependent on how frequently they come in contact with the sea, they can have marks of contact with other rocks or other pebbles. Pebbles left above the high water mark may have growths of organisms such as lichen on them, signifying the lack of contact with seawater.
The Pebble Smartwatch is a smartwatch developed by Pebble Technology Corporation and released in 2013 that received the majority of its initial funding via the crowdfunding platform Kickstarter. The watch features a black and white low power LCD, a programmable CPU, memory, storage, Bluetooth, a vibrating alert motor, a magnetometer, an ambient light sensor, and an accelerometer; these extend its use into many roles including interacting with smartphone notifications, activity tracking, gaming, map display, and golf tracking.
The Pebble is compatible with Android and iOS devices. When connected to one of these devices via Bluetooth, it will vibrate and display text messages, emails, incoming calls, and notifications from social media accounts when they are received on the paired device. It can also act as a remote control for the phone, or for cameras such as the GoPro. As of February 2014, the Pebble app store had over 1,000 applications developed using Pebble's free software development kit (SDK).
Pebble is a small clast of rock.
Pebble can also refer to:
For every next-to-be anomaly*
DNR must take a picture of me
Irregular
I have an issue, I pose my teeth
I have a strategy that works for me
Irregular
I have callouses on my knees
A hollow portfolio of history
Irregular
We are not idle children
Great and sticky with heat
Irregular
We are not idle children