Why are the western United States and Canada much more seismically active than the central and eastern regions? Does the smaller number of earthquakes in the central and eastern United States and Canada mean that we don’t have to worry about a “big one” there?

Q: How to find the contour interval of an entire topographic map?

A: The path guiding chart used by geologists or earth scientist is known as a map, and topographic mapp...

Q: What is sector collapse? What is a debris avalanche?

A: A sector collapse occurs when a portion of a volcano collapses due to gravity-driven movement of uns...

Q: What is hydraulic fracturing? How can it trigger an earthquake?

A: Hydraulic fracturing or fracking is a method of extracting commercially valuable fluids such as natu...

Q: Contrast the differences between basaltic and rhyolitic magma in terms of SiO2 percentage, weight % ...

A: In Basaltic magma, SiO2 is 45-55 wt% and high in Fe, Mg, Ca, low in K, Na. In Rhyolitic magma, SiO2 ...

Q: Change Detection can be used to show: A. The situation during and before the event B. The situation...

A: In Change Detection, satellite imagery or aerial photographs of a particular area taken at different...

Q: What is the energy source of: (a) everyday waves at the beach? (b) tidal waves? (c) tsunami?

A: The energy source of everyday waves at the beach is derived from the friction between wind and surfa...

Q: Draw a cross-section and describe the collapse of an oceanic volcano, such as Krakatau. What usually...

A: Krakatoa, a volcanic island present in Indonesia, was destroyed by the violent eruptions in 1883. Th...

Q: Which of the following statements is TRUE?Relative dating tells us how long ago something existed.Di...

A: Relative dating is used to find the age of something, for example, a rock formation relative to othe...

Q: Place the letters labeling rock layers, unconformities, faults and intrusions in order from youngest...

A: The rock layers, unconformities, faults and intrusions can be arranged in order from youngest to old...

Q: How did Earth’s continents, oceans, and atmosphere form?

A: 4.5 billion years ago Earth's surface was surrounded by a thick layer of atmosphere that consisted p...

Q: Explain the paleomagnetic evidence for seafloor spreading.

A: According to seafloor spreading, mid-ocean ridges are located in areas where mantle-derived convecti...

Q: True or False The upper boundary of the vadose zone is synonymous with the elevation of the water ta...

A: The rainwater collected under the ground and stored as a source of freshwater on the earth surface i...

Q: “Stable” central and eastern North America have earthquakes clustered in distinct areas. What is a l...

A: The clustering of seismic activity in the central and easter United States depends on the nature of ...

Q: Discuss 1 advantage and 1 disadvantage of the fast permeability rate.

A: Permeability refers to a medium's ability to transmit a fluid (usually water) flowing through the me...

Q: True or False: The returned signal from surface targets is known as backscatter?

A: To collect data using remote sensing, we require a source of energy. This source can either be natur...

Q: Earth is commonly called terra firma. Does this make good geologic sense?

A: Terra, meaning Earth and Firma, meaning solid is a term derived from Latin. The phrase is commonly u...

Q: How many years might one subduction zone operate? One volcano? How many years might pass between eru...

A: Most subduction zones will operate normally until the high density lithospheric plate is entirely su...

Q: Why are fires in cities so commonly associated with major earthquakes?

A: Fires are a recognized hazard associated with earthquakes, especially in cities and industrial areas...

Q: Is the killing power of tsunami due mostly to the wave heights or to the long wavelengths that allow...

A: Tsunami is a series of water waves highly disastrous to the coastal community. It is caused by the d...

Q: Which sedimentary rock process does NOT "fit" into the formation of a sedimentary rock? a. transpora...

A: Sedimentary rock cycle consists of the following steps. It includes: Weathering and erosion, transpo...

Q: Describe how Earth became segregated into layers of differing density.

A: During the accretionary stages of the earth, it was chemically homogeneous throughout. The young ear...

Q: During an earthquake, you probably will be safest if you _____, _____, and _____.

A: Earthquake can be occur anytime. Be prepared at any time and make the life safe at any situation by ...

Q: If gas escapes easily from a magma, will the eruption be peaceful or explosive? If gas cannot escape...

A: Gas gives magmas their explosive character because the gas expands as pressure is reduced. Explosive...

Q: According to the geothermal gradient above, what is the approximate temperature of the earth's mantl...

A: The temperature gradient knowledge comes from the seismic waves interpretation and understanding of ...