Rock - online puzzles

Rock (geology)

In geology, rock (or stone) is any naturally occurring solid mass or aggregate of minerals or mineraloid matter. It is categorized by the minerals included, its chemical composition, and the way in which it is formed. Rocks form the Earth's outer solid layer, the crust, and most of its interior, except for the liquid outer core and pockets of magma in the asthenosphere. The study of rocks involves multiple subdisciplines of geology, including petrology and mineralogy. It may be limited to rocks found on Earth, or it may include planetary geology that studies the rocks of other celestial objects.

Rocks are usually grouped into three main groups: igneous rocks, sedimentary rocks and metamorphic rocks. Igneous rocks are formed when magma cools in the Earth's crust, or lava cools on the ground surface or the seabed. Sedimentary rocks are formed by diagenesis and lithification of sediments, which in turn are formed by the weathering, transport, and deposition of existing rocks. Metamorphic rocks are formed when existing rocks are subjected to such high pressures and temperatures that they are transformed without significant melting.

Humanity has made use of rocks since the earliest humans. This early period, called the Stone Age, saw the development of many stone tools. Stone was then used as a major component in the construction of buildings and early infrastructure. Mining developed to extract rocks from the Earth and obtain the minerals within them, including metals. Modern technology has allowed the development of new man-made rocks and rock-like substances, such as concrete.

dramatic sunset in Varkala, Kerala, India sliding puzzle onlineBhangarh Fort, India online puzzlewhite and gray concrete house beside river during daytime sliding puzzle onlineSeville, Spain online puzzleNatural stones sliding puzzle onlinebrown brick building near green trees under white sky online puzzleRome, Italy online puzzleZakynthos Island sliding puzzle onlinethe old houses on the crane online puzzlethe quiet street ............ online puzzle2B Surv - HII1 sliding puzzle onlinefestive evening at home online puzzlechichen itza easy slide sliding puzzle onlinewhite concrete building surrounded by green trees online puzzlesouthern peru sliding puzzle onlinebrown wooden house near river online puzzleSimson Suhl SR2E online puzzlebrown rock formation under white clouds during daytime online puzzlebrown concrete building under blue sky during daytime sliding puzzle onlineThành nhà Hồ SVV BvsW sliding puzzle onlinebrown and black short coated dog online puzzlemayan art online puzzlewhite concrete building near green trees during daytime online puzzleRose Hall online puzzlepetra, jordan online puzzleMelnik pyramids online puzzleblack and white door during daytime online puzzlegray concrete castle under blue sky and white clouds sliding puzzle onlineblue and black motor scooter parked beside brown concrete building sliding puzzle onlinebrown wooden bench near brown wooden house online puzzlebrown concrete building with green plants sliding puzzle onlinewhite and brown concrete building near body of water online puzzlewhite concrete building under blue sky during daytime online puzzlebrown and white concrete buildings under blue sky sliding puzzle onlinewhite and brown house under white clouds during daytime online puzzleGrand Canyon West, West Rim, Arizona sliding puzzle onlinered bicycle parked beside green plants online puzzlewhite and brown concrete building online puzzlebrown wooden house covered with snow during daytime sliding puzzle onlinewhite concrete building with statues sliding puzzle online