What is a structure contour?
GeologyJust like a topographic contour, a structure contour is the line of intersection of a geologic surface with a horizontal plane. Because structure contours are by definition lines of constant elevation, they trend parallel to the strike of geologic structures. They are sometimes called strike lines. What is a structure contour map? A structure contour
What is the Tertiary time period?
Geologyapproximately 66 million to 2.6 million years agoformer official interval of geologic time lasting from approximately 66 million to 2.6 million years ago. It is the traditional name for the first of two periods in the Cenozoic Era (66 million years ago to the present); the second is the Quaternary Period (2.6 million years ago
How can you tell what time an earthquake is?
GeologyWe do not know how, and we do not expect to know how any time in the foreseeable future. USGS scientists can only calculate the probability that a significant earthquake will occur (shown on our hazard mapping) in a specific area within a certain number of years. How can you tell what time an earthquake
What are the effects of hydrometeorological hazards?
GeologyHydrometeorological hazards, including floods, droughts, landslides and storm surges, can pose a direct threat to lives and impact livelihoods by damaging and destroying transport links, power supplies, businesses and agricultural land. What are the effects of meteorological disaster? The effects of all these disasters can be in many different forms. For example, frequent floods bring
Is a pebble a sedimentary rock?
GeologyEven though pebbles are composed of rock, they can not be considered sedimentary rock in a state where we observe them on the beach. Lying under the sun, pebbles are considered to be sediment. Only when pebbles are compacted and cemented can they be called conglomerate – a clastic sedimentary rock. What types of rocks
What minerals are in pink granite?
GeologyPink Granite Pink colored granite is a result of an abundance of potassium feldspar within the granite. You can see small specs of milky semi-transparent quartz, dark brown/black amphibole, and opaque white feldspar. However, in a granite like the one above the primary mineral is potassium feldspar. What type of rock is granite pink? felsic
How much water does the earth have?
GeologyOne estimate of global water distribution Water source Water volume, in cubic miles Percent of total water Oceans, Seas, & Bays 321,000,000 96.54 Ice caps, Glaciers, & Permanent Snow 5,773,000 1.74 Groundwater 5,614,000 1.69 Fresh How much water is the earth? About 71% Just how much water is there on Earth? About 71% of Earth’s
What is the crushing strength of granite?
GeologyThe compressive strength is the maximum load per unit area that the stone can bear without crushing. A higher compressive strength indicates that the stone can withstand a higher crushing load. The required values range from 1,800 psi (12.45 MPa) for marble to 19,000 psi (131 MPa) for granite. Which stone has highest crushing strength?
What is slumping in geography?
GeologyA slump is a form of mass wasting that occurs when a coherent mass of loosely consolidated materials or a rock layer moves a short distance down a slope. Movement is characterized by sliding along a concave-upward or planar surface. What is the definition of slumping in geography? slump, in geology, downward intermittent movement of
How do Strainmeters work?
GeologyA strainmeter is an instrument used by geophysicists to measure the deformation of the Earth. Linear strainmeters measure the changes in the distance between two points, using either a solid piece of material (over a short distance) or a laser interferometer (over a long distance, up to several hundred meters). How effective are tiltmeters? While