Define by rocks
1) Igneous rock-
2) Granite-
3) Basalt-
4) Obsidian-
5) Pumice-
6) sedimentary-
7) Fossils-
8) Sandstone-
9) Limestone-
10) Shala-
Answers
Answer:
Basalt
Basalt is a hard, black volcanic rock. Basalt is the most common rock type in the Earth's crust.
Depending on how it is erupted, basalt can be hard and massive.
Limestone
Limestone is a sedimentary rock. It is formed by layers of small pieces of rock and stones pressed hard together. The stone forms in wet areas which mean it will also contain of shells and waste matter from organisms that live in water.Limestone caves are formed when rainwater seeps through cracks in limestone rock and dissolves it. Limestone turns into the metamorphic rock marble when it is subjected to high amounts of pressure and heat.
Shale
Shale rocks are those that are made of clay-sized particles and are have a laminated appearance. They are a type of sedimentary rock. Shale is the abundant rock found on Earth. They are usually found in areas where gentle waters have deposited sediments that become compacted together. Shale usually forms in sheets. Clay is a key component in shale rock. After formation, shale is usually deposited into lakes and rivers by slow moving water. Shale that is exposed to extreme heat and pressure can change into slate.
Sandstone
Sandstone is a type of sedimentary rock. It forms when grains of sand are compacted together over very long periods of time. Normally this sand has an abundance of quartz but can also contain other minerals and materials. Sandstone comes in a variety of colors including red, yellow, gray, and brown. Sandstone can form under the sea or on land.
Granite
Granite is an igneous rock composed of mostly two minerals: quartz and feldspar. It is an intrusive rock, meaning that it crystallized from magma that cooled far below the earth's surface. Granites usually have a coarse texture (individual minerals are visible without magnification), because the magma cools slowly underground, allowing larger crystal growth. It is the most common igneous rock.
Obsidian
Obsidian rock are igneous rocks that form when lava cools quickly above ground. The result is a rock that cooled so fast, crystals did not get a chance to form. Obsidian is a volcanic glass with a smooth and uniform structure. Obsidian can only form near active volcanoes.
Pumice
Pumice is an extrusive igneous rock formed as a result of volcanic eruptions. Extrusive means that it forms outside of the volcano (as opposed to inside the volcano in the magma chamber), and as a result, the magma cools quickly after exiting the volcano. Little pockets of air can be seen in them. This rock is so light, that many pumice rocks will actually float in water. Pumice is actually a kind of glass and not a mixture of minerals.
Igneous
Igneous rock, or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic. Igneous rock is 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.
Sedimentary
Sedimentary rocks are types of rock that are formed by the accumulation or deposition of mineral or organic particles at the Earth's surface, followed by cementation. Sedimentation is the collective name for processes that cause these particles to settle in place.
Fossil
A fossil is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved in amber, hair, petrified wood, oil, coal, and DNA remnants.