Igneous rockIgneous rock (igneous ), or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic. Igneous rocks are formed through the cooling and solidification of magma or lava. The magma can be derived from partial melts of existing rocks in either a planet's mantle or crust. Typically, the melting is caused by one or more of three processes: an increase in temperature, a decrease in pressure, or a change in composition. Solidification into rock occurs either below the surface as intrusive rocks or on the surface as extrusive rocks.
PulcheriaAelia Pulcheria (ˈiːliə_pʌlˈkɪriə; Πουλχερία; 19 January 398 or 399 – July 453) was an Eastern Roman empress who advised her brother emperor Theodosius II during his minority and then became wife to emperor Marcian from November 450 to her death in 453. She was the second (and oldest surviving) child of Eastern Roman Emperor Arcadius and Empress Aelia Eudoxia. In 414, the fifteen-year old Pulcheria became the guardian of her younger brother Theodosius II and was also proclaimed Augusta.
IstanbulIstanbul (ˌɪstænˈbʊl , USalsoˈɪstænbʊl ; İstanbul isˈtanbuɫ), formerly known as Constantinople (Κωνσταντινούπολις; Constantinopolis; Ottoman Turkish: قسطنطينيه), is the largest city in Turkey, serving as the country's economic, cultural and historic hub. The city straddles the Bosporus strait, lying in both Europe and Asia, and has a population of over 15 million residents, comprising 19% of the population of Turkey. Istanbul is the most populous European city and the world's 15th-largest city.
Volcanic rockVolcanic rock (often shortened to volcanics in scientific contexts) is a rock formed from lava erupted from a volcano. Like all rock types, the concept of volcanic rock is artificial, and in nature volcanic rocks grade into hypabyssal and metamorphic rocks and constitute an important element of some sediments and sedimentary rocks. For these reasons, in geology, volcanics and shallow hypabyssal rocks are not always treated as distinct. In the context of Precambrian shield geology, the term "volcanic" is often applied to what are strictly metavolcanic rocks.
DioriteDiorite (ˈdaɪ.əraɪt ) is an intrusive igneous rock formed by the slow cooling underground of magma (molten rock) that has a moderate content of silica and a relatively low content of alkali metals. It is intermediate in composition between low-silica (mafic) gabbro and high-silica (felsic) granite. Diorite is found in mountain-building belts (orogens) on the margins of continents. It has the same composition as the fine-grained volcanic rock, andesite, which is also common in orogens.
Subvolcanic rockA subvolcanic rock, also known as a hypabyssal rock, is an intrusive igneous rock that is emplaced at depths less than within the crust, and has intermediate grain size and often porphyritic texture between that of volcanic rocks, which are extrusive igneous rocks, and plutonic rocks, which form much deeper in the ground. Subvolcanic rocks include diabase (also known as dolerite) and porphyry. Common examples of subvolcanic rocks are diabase, quartz dolerite, microgranite, and diorite.
ArcadiusArcadius (Ἀρκάδιος ; 377 – 1 May 408) was Roman emperor from 383 to his death in 408. He was the eldest son of the Augustus Theodosius I (379-395) and his first wife Aelia Flaccilla, and the brother of Honorius (393-423). Arcadius ruled the eastern half of the empire from 395, when their father died, while Honorius ruled the west. A weak ruler, his reign was dominated by a series of powerful ministers and by his wife, Aelia Eudoxia. Arcadius was born in 377 in Hispania, the eldest son of Theodosius I and Aelia Flaccilla, and brother of Honorius.
Roman sculptureThe study of Roman sculpture is complicated by its relation to Greek sculpture. Many examples of even the most famous Greek sculptures, such as the Apollo Belvedere and Barberini Faun, are known only from Roman Imperial or Hellenistic "copies". At one time, this imitation was taken by art historians as indicating a narrowness of the Roman artistic imagination, but, in the late 20th century, Roman art began to be reevaluated on its own terms: some impressions of the nature of Greek sculpture may in fact be based on Roman artistry.
Texture (geology)In geology, texture or rock microstructure refers to the relationship between the materials of which a rock is composed. The broadest textural classes are crystalline (in which the components are intergrown and interlocking crystals), fragmental (in which there is an accumulation of fragments by some physical process), aphanitic (in which crystals are not visible to the unaided eye), and glassy (in which the particles are too small to be seen and amorphously arranged).
EgyptEgypt (مصر ALA mɑsʕr), officially the Arab Republic of Egypt, is a transcontinental country spanning the northeast corner of Africa and the Sinai Peninsula in the southwest corner of Asia. It is bordered by the Mediterranean Sea to the north, the Gaza Strip of Palestine and Israel to the northeast, the Red Sea to the east, Sudan to the south, and Libya to the west. The Gulf of Aqaba in the northeast separates Egypt from Jordan and Saudi Arabia.
