Category: Geology

What was the worst earthquake in history?

Great Alaska Earthquake (1964)– 9.2 It lasted approximately 4.5 minutes and is the most powerful recorded earthquake in U.S. history. The earthquake triggered 27-foot (8.2 meters) tsunami which destroyed the village of Chenega, killing 23 of the 68 people who lived there. Has there ever been a 10.0 earthquake? No, earthquakes of magnitude 10 or

How did Hope BC get its name?

Hope was established 1848-49 as a Hudson’s Bay Company post at the western end of its Brigade Trail from Fort Kamloops (see KAMLOOPS), and was so named in the hope that this trail would provide an all-British route between forts Kamloops and LANGLEY. What is Hope BC known? Visitors can also take a self-guided tour

What does siltstone feel like?

We cannot see the difference between these rocks, but it turns out that siltstone feels gritty when nibbled or rubbed against a tooth whereas claystones feel smooth. If you find a claystone, you know that it accumulated in a very quiet environment with almost still water. What is the texture of siltstone? Siltstone Type Sedimentary

What areas are susceptible to liquefaction?

The highest hazard areas are concentrated in regions of man-made landfill, especially fill that was placed many decades ago in areas that were once submerged bay floor. Such areas along the Bay margins are found in San Francisco, Oakland and Alameda Island, as well as other places around San Francisco Bay. How do you know

What type of dating uses the law of superposition?

The Law of Superposition, which states that older layers will be deeper in a site than more recent layers, was the summary outcome of ‘relative dating‘ as observed in geology from the 17th century to the early 20th century. Is the law of superposition absolute dating? Geologists use the law of superposition to determine the

How are the asthenosphere and the lithosphere different?

Summary. The lithosphere is the brittle crust and uppermost mantle. The asthenosphere is a solid but it can flow, like toothpaste. The lithosphere rests on the asthenosphere. What is the difference between the Earth’s lithosphere and asthenosphere quizlet? The lithosphere and the asthenosphere are both parts of a mantle and parts of the interior earth.

What are methods of relative aging of rocks?

Determining the numerical age of rocks and fossils Name of Method Age Range of Application Radiocarbon 1 – 70,000 years K-Ar dating 1,000 – billion of years Uranium-Lead 10,000 – billion of years Uranium series 1,000 – 500,000 years What method is used to find a relative age of a rock? The age of rocks

What is the volcanic explosivity index vei of a Yellowstone super eruption?

88, the largest recorded value on the index. What is the VEI of Yellowstone? Explosivity (Volcanic Explosivity Index) – 8. Top of the scale – Yellowstone has had three of the largest eruptions known over the past 3 million years; only beaten by Toba in Indonesia, which erupted about 74,000 years ago. Each of these

What is the movement of tectonic plates called?

The heat from radioactive processes within the planet’s interior causes the plates to move, sometimes toward and sometimes away from each other. This movement is called plate motion, or tectonic shift. What are the three movements of tectonic plates? Movement in narrow zones along plate boundaries causes most earthquakes. Most seismic activity occurs at three

What are the three main types of sedimentary rocks?

Sedimentary rocks are formed from pieces of other existing rock or organic material. There are three different types of sedimentary rocks: clastic, organic (biological), and chemical. Clastic sedimentary rocks, like sandstone, form from clasts, or pieces of other rock. What is the difference between the 3 types of sedimentary rocks? Clastic sedimentary rocks are made

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