which of these is a characteristic of hydrothermal vents?
16876
Hydrothermal vents are like geysers, or hot springs, on the ocean floor. Along mid-ocean ridges where tectonic plates spread apart, magma rises and cools to form new crust and volcanic mountain chains. Seawater circulates deep in the ocean's crust and becomes super-heated by hot magma.
453277
Chordates are deuterostomes with four unique characteristics which appear some time during the animal's life. These characteristics are the notochord, a dorsal, hollow nerve cord, pharyngeal slits, and a muscular postanal tail.
845987
The primary factors that determine the nature of volcanic eruptions include the magma's temperature, its composition, and the amount of dissolved gases it contains. As lava cools, it begins to congeal, and as viscosity increases, its mobility decreases.
946894
A volcanic "hotspot" is an area in the mantle from which heat rises as a thermal plume from deep in the Earth. High heat and lower pressure at the base of the lithosphere (tectonic plate) facilitates melting of the rock. This melt, called magma, rises through cracks and erupts to form volcanoes.
516452
['Single-Celled. Perhaps the most straightforward characteristic of bacteria is their existence as single-celled organisms. ... ', 'Absent Organelles. ... ', 'Plasma Membrane. ... ', 'Cell Walls. ... ', 'DNA.']
224561
['basic lava, which is non-acidic and very runny.', 'gentle sides as the lava flows for long distances before it solidifies.', 'no layers, as the volcano just consists of lava.', 'less violent eruptions.', 'shorter periods between eruptions.']
1451382
There are two main types of volcano - composite and shield. The two types of volcano form in different places and have very different characteristics.
902530
In general, eruptions can be categorized as either effusive or explosive. Effusive eruptions involve the outpouring of basaltic magma that is relatively low in viscosity and in gas content. Explosive eruptions generally involve magma that is more viscous and has a higher gas content.
654573
The style of eruption depends on a number of factors, including the magma chemistry and content, temperature, viscosity (how runny the magma is), volume and how much water and gas is in it, the presence of groundwater, and the plumbing of the volcano.
954266
['5 characteristics of a mineral. solid, naturally occurring, inorganic, fixed composition, crystal form.', "Solid. can't be a liquid or a gas.", 'naturrally occurring. found in nature, not manmade.', 'inorganic. is not alive and never was, nonliving.', 'Fixed composition. ... ', 'Crystal Form.']
395599
A geyser is a vent in Earth's surface that periodically ejects a column of hot water and steam. Even a small geyser is an amazing phenomenon; however, some geysers have eruptions that blast thousands of gallons of boiling-hot water up to a few hundred feet in the air.
484007
There are two types of eruptions in terms of activity, explosive eruptions and effusive eruptions. Explosive eruptions are characterized by gas-driven explosions that propels magma and tephra. Effusive eruptions, meanwhile, are characterized by the outpouring of lava without significant explosive eruption.
112149
Characteristics. The defining characteristic of the intertidal zone is that it is submerged with water during high tide and exposed to the air during low tide. The zone can take many forms, from sandy beaches to rocky cliffs.
127911
['distance from the sea.', 'ocean currents.', 'direction of prevailing winds.', "shape of the land (known as 'relief' or 'topography')", 'distance from the equator.', 'the El Niño phenomenon.']
844881
Magma exists in the mantle and lower crust, and sometimes bubbles to the surface as lava. Magma heats nearby rocks and underground aquifers. Hot water can be released through geysers, hot springs, steam vents, underwater hydrothermal vents, and mud pots. These are all sources of geothermal energy.
866070
['continental margins.', 'deep ocean basins.', 'mid-ocean ridges.']
133560
A volcanic crater can be of large dimensions, and sometimes of great depth. During certain types of explosive eruptions, a volcano's magma chamber may empty enough for an area above it to subside, forming a type of larger depression known as a caldera.