The shells of amoebas are often composed of calcium.

Almonds are sold shelled ( i. e., after the shells are removed ), or unshelled ( i. e., with the shells still attached ).

Each atom has, in general, many orbitals associated with each value of n ; these orbitals together are sometimes called electron shells.

Other common names are ear shells, sea ears, as well as muttonfish or muttonshells in Australia, ormer in Great Britain, and venus's-ears in South Africa and in New Zealand.

The shells of abalones have a low and open spiral structure, and are characterized by several open respiratory pores in a row near the shell's outer edge.

The meat ( foot muscle ) of abalone is used for food, and the shells of abalone are used as decorative items and as a source of mother of pearl for jewelry and other decorative items.

Highly polished New Zealand pāua shells are extremely popular as souvenirs with their striking blue, green, and purple iridescence.

The shells of abalone are occasionally used in New Age smudging ceremonies to catch falling ash.

E. tenera are spiral freshwater gastropods having elongated, spiral shells composed of many whorls.

* 1942 – World War II: The most famous ( and first international ) Aggie Muster is held on the Philippine island of Corregidor, by Brigadier General George F. Moore ( with 25 fellow Texas A & M graduates who are under his command ), while 1. 8 million pounds of shells pounded the island over a 5 hour attack.

* Laser guided shells require laser target designators, usually with observation teams on the ground but UAV installations are possible.

A pair of beads made from Nassarius sea snail shells, approximately 100, 000 years old, are thought to be the earliest known examples of jewellery.

Brachiopods, generally thought to be closely related to bryozoans and phoronids, are distinguished by having shells rather like those of bivalves.

These are sites of exceptional preservation, where ' soft ' parts of organisms are preserved as well as their more resistant shells.

The microscopic shells of radiolarians are found in cherts of this age in the Culm of Devon and Cornwall, and in Russia, Germany and elsewhere.

Brachiopods are also abundant ; they include productids, some of which ( for example, Gigantoproductus ) reached very large ( for brachiopods ) size and had very thick shells, while others like Chonetes were more conservative in form.

Cadmium and its congeners are not always considered transition metals, in that they do not have partly filled d or f electron shells in the elemental or common oxidation states.

Cadmium and its congeners are not always considered transition metals, in that they do not have partly filled d or f electron shells in the elemental or common oxidation states.

Early markings from this period found on pottery and shells are thought to be ancestral to modern Chinese characters.

The most common are calcite or calcium carbonate, CaCO < sub > 3 </ sub >, the chief constituent of limestone ( as well as the main component of mollusc shells and coral skeletons ); dolomite, a calcium-magnesium carbonate CaMg ( CO < sub > 3 </ sub >)< sub > 2 </ sub >; and siderite, or iron ( II ) carbonate, FeCO < sub > 3 </ sub >, an important iron ore.

When the organisms die, their shells are deposited as sediment and eventually turn into limestone.

The demand for iron products, such as armor for gunboats, cannon, and shells, as well as a hundred other industrial products, made Pittsburgh a center of wartime production.

Diatomaceous earth is a soft, siliceous, sedimentary rock made up of the cell walls / exoskeleton | shells of single cell diatoms and which readily crumbles to a fine powder.

With some exceptions, such as medical alert bracelets or military dog tags, jewellery normally differs from other items of personal adornment in that it has no other purpose than to look appealing, but humans have been producing and wearing it for a long time – with 100, 000-year-old beads made from Nassarius shells thought to be the oldest known jewellery.

Jewellery may be made from a wide range of materials, but gemstones, precious metals, beads and shells have been widely used.

These may be made of glass, gemstones, metal, wood, shells, clay and polymer clay.

These organisms secrete shells made of aragonite or calcite, and leave these shells behind after the organisms die.

This suggestion was first made in 1931 by Paul Ehrenfest, who pointed out that the electrons of each atom cannot all fall into the lowest-energy orbital and must occupy successively larger shells.

Originally made from wood, shells are now almost always made from a composite material ( usually a double skin of carbon-fibre reinforced plastic with a sandwich of honeycomb material ) for strength and weight advantages.

With the smaller boats, specialist versions of the shells for sculling can be made lighter.

Numerous necklaces made of shells from Cypraca thermophile gastropods of the Tertiary period have come from the sites of Moravany-Žákovská, Podkovice, Hubina and Radošina.

Diatomaceous earth, as viewed under a microscope, is a soft, siliceous, sedimentary rock made up of the frustule s ( shells ) of single cell diatoms.

The modern thin-walled forged-steel design made feasible shrapnel shells for howitzers, which had a much lower velocity than field guns, by using a larger gunpowder charge to accelerate the bullets forward on bursting.

Sometimes shields were made of metal, but wood or animal hide construction was much more common ; wicker and even turtle shells have been used.

The first pottery was made of thick clay mixed with pebbles, shells or plants.

Their shells were made of calcite extracted from the rich sea-water.

Bombs made of cast iron shells packed with explosive gunpowder date to 13th century China.

The British suffered heavy losses, especially due to machine gun fire, during the attack and made only limited gains before they ran out of shells.

For example, in 235, when, as a sign of contempt, Wei's emperor Cao Rui offered horses to him in exchange for pearls, jade, and tortoise shells, Sun Quan ignored the implicit insult and made the exchange, reasoning that his empire needed horses much more than pearls, jade, or tortoise shells.

These data include artifacts ( objects made or modified by humans ), features ( modifications to the site itself such as post molds, burials, and hearths ), ecofacts ( evidence for the local environment and resources being used such as snail shells, seeds, and butchered bones ).

For the most part packaging relied on traditional plastic shells with a photocopied " J-card " insert, but some labels made more of an effort.