Most agates occur as nodules in volcanic rocks or ancient lavas where they represent cavities originally produced by the disengagement of volatiles in the molten mass which were then filled, wholly or partially, by siliceous matter deposited in regular layers upon the walls.

Most macroscopic inorganic solids are polycrystalline, including almost all metals, ceramics, ice, rocks, etc.

Most of the beaches consist of either grass, rocks, or the silty sand that also makes up most of the bottom of the lake.

Most achondrites are also ancient rocks, and are thought to represent crustal material of asteroids.

Most rocks, due to their components, have a certain, but low, level of radioactivity.

Most collectibles are man-made commercial items, but some private collectors collect natural objects such as birds ' eggs, butterflies, rocks, and seashells.

Most of the islands have a bedrock formed from ancient metamorphic rocks and the climate is mild and oceanic.

Most authors presently use the term " mudrock " to refer to all rocks composed dominantly of mud.

Most sedimentary rocks contain either quartz ( especially siliciclastic rocks ) or calcite ( especially carbonate rocks ).

Most live in freshwater, and form an important component of the algal scum that grows on or near plants, rocks, and various debris.

Most surviving Archean rocks are metamorphic or igneous.

Most of the fossil echinoids from the Paleozoic era are incomplete, consisting of isolated spines and small clusters of scattered plates from crushed individuals, mostly in Devonian and Carboniferous rocks.

Most of these rocks are clastics ( conglomerate, sandstone, shale ), and there is little or no limestone exposed at the surface.

Most geologists now accept the theory that the older rocks at the center of the uplift are a result of this deep seated igneous activity.

Most crustal rocks formed before 2. 5 billion years ago are located in cratons.

Most young humans have been said to play with whatever they can find, such as pine cones and rocks.

Most commonly, an escarpment is a transition from one series of sedimentary rocks to another series of a different age and composition.

Most of the highest ground is formed by the masses of granite which have been intruded into the Ordovician and Silurian rocks ; the Criffel mass lies about Dalbeattie and Bengairn, another mass extends east and west between the Cairnsmore of Fleet and Loch Ken, another lies northwest and southeast between Loch Doon and Loch Dee and a small mass forms the Cairnsmore of Carsphairn.

Most of the terrain, except for indestructible rocks, may be dug or destroyed by explosions.

Most of the base of the mountain lies in the Tsaté nappe, a remnant of the Piedmont-Liguria oceanic crust ( ophiolites ) and its sedimentary rocks.

Most types of igneous rocks may display some degree of porphyritic texture.

Most types of igneous rocks may display some degree of porphyritic texture.

Most hydroxyapatite ceramics are very porous and lack mechanical strength, and are used to coat metal orthopedic devices to aid in forming a bond to bone or as bone fillers.

* Most of the energy made available by the oxidative steps of the cycle is transferred as energy-rich electrons to NAD < sup >+</ sup >, forming NADH.

Most of the novels from this period are recognized by critics as forming an offshoot from the Future History series, and referred to by the term World as Myth.

Most Slovenes lived in the administrative region known as Inner Austria, forming the majority of the population of the Duchy of Carniola and the County of Gorizia and Gradisca, as well as of Lower Styria and southern Carinthia.

Most divergent plate boundaries are at the bottom of the oceans, therefore most volcanic activity is submarine, forming new seafloor.

Most of the exchanges in the world are connected to each other, forming the public switched telephone network ( PSTN ).

Most natural arches form as a narrow ridge, walled by cliffs, become narrower from erosion, with a softer rock stratum under the cliff-forming stratum gradually eroding out until the rock shelters thus formed meet underneath the ridge, thus forming the arch.

Most geographers, in fact, do not look upon India as bounded by the river Indus, but add to it the four satrapies of the Gedrose, the Arachotë, the Aria, and the Paropamisadë, the River Cophes thus forming the extreme boundary of India.

Most major streets adhere to a north-south / east-west orientation, forming a grid of major streets spaced one mile ( 1. 6 km ) apart from each other.

Most of these became part of the fill dirt forming the base of the current highway and city.

Most other shell forming organisms appear during the Cambrian period, with the Bryozoans being the only calcifying phylum to appear later, in the Ordovician.

Most drag is caused by eddies in the fluid behind the moving object, and the objective should be to allow the fluid to slow down after passing around the object, and regain pressure, without forming eddies.

The laboratory had an outer diameter of 4. 12 m, and each segment a length of 2. 7 m. Most of the time two segments were used in forming the Long Module configuration.

Most of these people feel they were not sufficiently warned in advance of the drug's side effects — particularly the withdrawal syndrome, after GSK had specifically advertised the drug as non-habit forming.

Most of these musicians became instrumental in forming jazz music including Buddy Bolden, Bunk Johnson and the members of Original Dixieland Jass Band.

Most of Longford lies in the basin of the River Shannon with Lough Ree forming much of the county's western boundary.

The PES Chairman, Poul Nyrup Rasmussen, explained in The Slovak Spectator that " Most of our members stood solidly behind our values, according to which forming a coalition with the extreme right is unacceptable.

( Most of these were reservists who had not been able to join their units before the units were hastily dispatched to join the armies forming up near the frontier.

Most of the area today called northern England and been overrun by the invading Angles of Deira and Bernicia who were in the process of forming a united Northumbrian kingdom.

Most noodlers have spotters who help them bring the catfish in, either to shore or to their boat ; noodling in pairs is considered important for safety, and also makes it a more social activity, with noodling partners often forming long-term partnerships.

Most inheritance tax treaties permit each county to tax domiciliaries of the other country on real property situated in the taxing country, property forming a part of a trade or business in the taxing country, tangible movable property situated in the taxing country at the time of transfer ( often excluding ships and aircraft operated internationally ), and certain other items.

Most but not all neutron absorptions result in fission ; a minority result in neutron capture forming uranium-236.

Most notably though, Wallace E. Pratt donated 5, 632 acres ( 23 km² ), which included McKittrick Canyon, to the National Park Service, forming the core of the Guadalupe Mountains National Park.

Most of the nutrients that are present in the soil are washed away by torrents that cascade over the edge, forming some of the highest waterfalls in the world.