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Geophysics
The study of Earth using the combination of Geology and Physics, it lets us understand what is going on under the Earth's surface. Find questions on different types of seismic activities such as earthquakes and volcano eruptions here.
1,480 Questions
Why does runoff not seep into the ground in steep slopes?
In areas of steep slopes, the ground is slanted as simple as that. as such, when there's runoff water the water doesn't seep through the ground but rather flows along the ground at a certain speed which doesn't give it sufficient time to seep through the ground.. this doesn't mean it doesn't seep through at all because it does but it's doesn't drain deep into the ground as expected on flat grounds..
What is the streak luster hardness and crystal system of petroleum?
Petroleum is a liquid mixture of hydrocarbons. It does not have a streak luster, hardness, or crystal system as it is not a mineral but rather a naturally occurring substance derived from organic matter.
sandstone, mudstone, shale, grey wacke. All classified by their grainsize. They're used to determine paleo-turbidity sequences. Refer to hjulstrom diagram for more detailed classification chart
What destruction does a tsunami cause?
It really depends on how big the tsunami is. Some can reach up to hundreds of feet and cause billions of dollars worth of damage. Some tsunamis don't cause as much damage. Kills living things, distorys structures, and causes flooding.
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Also it leaves people homeless :'( and has mass destruction
Quartz is first mined from the earth using techniques such as open-pit mining or underground mining. It is then crushed into smaller pieces and purified to remove impurities. The purified quartz is then molded into various shapes and sizes based on its intended use, such as countertops, jewelry, or electronics components.
What are P and S waves also called?
there are 3 types of shock waves produced by an earthquake:
the P waves which is known as the (primary or compression) waves are the first to arrive at the recording station, p waves are formed when matter in the rocks is pushed together by the earth's movement. they can travel through solids and liquids.
the S waves which is known as the (secondary )waves are the second waves to arrive at the recording station. this waves are also called the shear waves. these waves are formed by the sideways motion of matter, it can only travel through solids.
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Secondary waves are also known as shear waves and primary waves are also known as pressure waves.
Which sphere is dependent on all the other spheres in order to exist?
The biosphere is dependent on all other spheres (atmosphere, hydrosphere, lithosphere) in order to exist. It is the sphere where living organisms interact with the other spheres to create a web of life.
Who discovered the boundary between the crust and the mantle?
The boundary between the crust and the mantle was discovered by Croatian seismologist Andrija Mohorovičić in 1909. This boundary is known as the Mohorovičić discontinuity or "Moho" and marks the change in seismic wave velocities between the Earth's crust and mantle.
Do feldspars and quartz make up more than 50 percent of the Earth's crust?
Yes, feldspars and quartz make up more than 50 percent of the Earth's crust. Feldspars are the most abundant group of minerals in the crust, while quartz is one of the most common minerals found in continental rocks. Together, they contribute significantly to the composition of the Earth's crust.
What are seismic disturbances?
Seismic disturbances are vibrations or movements in the Earth's crust caused by the release of energy from within the Earth, such as earthquakes, volcanic eruptions, or underground nuclear tests. These disturbances can cause shaking, ground displacement, and destruction on the Earth's surface.
What are some ways nature challenges us?
Nature can challenge us by natural disasters like tornadoes, earthquake, hurricane, flood, volcano eruption etc....
Who invented continental drift theory?
Alfred Wegener, a German meteorologist, proposed the theory of continental drift in the early 20th century. He suggested that the continents were once part of a single supercontinent called Pangaea that broke apart and drifted to their current positions. Although his ideas were initially met with skepticism, they formed the foundation for the modern theory of plate tectonics.
It would take about 5-7 minutes for the primary or P-waves to reach a seismograph station in Miami, Florida from Seattle, Washington. These waves travel faster than secondary or S-waves, which would arrive a few minutes later.
Is there seismic activity in Mariana's Trench?
There is minimal seismic activity in Mariana's Trench due to its remote location in the Western Pacific Ocean. The trench is located near the boundary of two tectonic plates, the Pacific Plate and the Philippine Sea Plate, which can lead to some earthquakes and subduction zone activity. However, the extreme depth of the trench means that seismic waves are often absorbed or weakened before reaching the surface.
Fumaroles are formed when water seeps underground and comes in contact with hot rocks or magma, causing it to heat up and turn into steam. The steam then rises to the surface through cracks or vents in the ground, creating fumaroles. These hydrothermal features are commonly found in volcanic areas or geothermal regions.
Where did the word oasis come from?
The word "oasis" comes from the Ancient Greek word "oasis," which means a fertile spot in the desert where water can be found, typically surrounded by vegetation. This term was then adopted into Latin before being borrowed into other languages.
How earth will destroy after 30 years?
It is impossible to predict exactly how Earth will be destroyed in 30 years. However, factors such as climate change, environmental degradation, natural disasters, and potential asteroid impacts could pose significant threats to the planet's future. It is important for humanity to take action now to mitigate these risks and preserve the Earth for future generations.
What are the reason for flood?
Most floods in some parts of the world are caused by rapid spring snow melt or storms that bring heavy rains over a large region. Rising sea levels from global warming are also causing flooding in low lying coastal areas.
More precipitation (rain, snow) than runoff results in local flooding. Agricultural and forestry practices can greatly affect the capacity of land to hold water. Cutting all the trees in an area will cause "unnatural" water levels below and on the ground.
In regions such as Australia where melting snow does not cause floods, they can be caused by excessive rainfall resulting from severe storms (a common cause of flash floods), cyclones that degenerate into depressions, or seasonal monsoons. These may dump large amounts of rain in river catchments, and slowly, these floods continue for thousands of kilometres through Australia's complex river systems. Because inland Australia is so flat, these "slow onset" floods can be hundreds of kilometres wide across the flat land.
In low-lying areas of Asia, flooding is caused by high tides and storm surges associated with wild weather. The flooding in these areas is intensified because large numbers of people live along the coast and rely on the oceans for their livelihood. When storm surges, tidal waves and even minor tsunamis occur, it swamps tens of thousands of homes and farms.
Different places have their own reasons of flooding. The major source of flooding includes human factors and natural causes.
Natural causes
Lack of lacks to regulate the river flow is one of the factors. Lakes act like a large water tank to store up excess water. Silting in river channels make the river beds shallower and storage capacity will be reduced. When there's heavy rain, the river may not able to store up all the water and flooding will occur. Heavy and continuous rain and typhoon are also the causes. Typhoon can push sea water on to the coastal areas and creates storm surge. Countries which are influenced by monsoon winds receive large amount of rainfall in summer, also the snow melt water from the surrounding mountains will go downward as well.
Human factors
People cut trees for developing makes the land surface lose the protection of vegetation and less vegetation are left to absorb the rainwater. Then silting will be more serious and rainwater is washed into the rivers more quickly. Wrong farming methods and overgrazing also speed up loss of soil. Some farmers reclaim along the shore of rivers will reduce the capacity of rivers.
Why is the philippines a hazard prone country?
The Philippines lie in the direct path of Pacific typhoons so the islands are flooded regularly. The nation also lies in the Ring of Fire making it prone to earthquakes and volcanic eruptions.
How many places on earth are missing 1 billion years of geologic record?
Quite a few when you consider that the oceanic crust in its entirety is less than 200 million years old and the Earth has been around for over 4.5 billion years. Of course there are others that are land based like Hawaii and other hot spots located on continents or in places where large scale erosion or lack of deposition has occurred.
The velocities of seismic waves traveling from earthquake foci?
The velocities of seismic waves traveling from earthquake foci depend on the type of waves and the properties of the material they travel through. For example, P waves are faster than S waves because they are compressional waves that can travel through both solids and liquids. The speed of seismic waves can also give information about the nature and structure of the Earth's interior.
Forms when water is drawn away from the area between high tides?
A tidal pool is formed when water is drawn away from the intertidal zone during low tide, leaving a shallow pool of water behind. These pools can support a variety of marine life until the tide returns and replenishes them with ocean water.
What did scientists believe before the continental drift theory?
The world in our normal experience appears to be very solid. Continents do not appear to be moving. If you do not understand that continental plates float on the magma beneath, it would seem to be ridiculous that anything as large and heavy and solid as a continent could move at all.
The period of time in which a long term reduction of temperature in the earth's surface occured?
The period of time in which a long-term reduction of temperature in the Earth's surface occurred is known as an ice age. Ice ages are characterized by the expansion of ice sheets and glaciers, leading to lower global temperatures and altered climate patterns. These periods have occurred multiple times in Earth's history, with the most recent ice age ending around 11,700 years ago.
Where are the densest population areas of North America located?
The densest population areas of North America are typically found in major urban centers such as New York City, Los Angeles, Mexico City, and Toronto. These cities have large populations and high population densities due to their economic opportunities, cultural attractions, and infrastructure.
