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Earth Sciences
Earth Sciences is the study of the Earth in terms of Geography, Geology, Geophysics, etc. It combines the use of Sciences such as Biology, Chemistry, Physics and Mathematics to understand the Earth System.
34,763 Questions
Where does energy come from that causes the earth to change?
The Earth's energy primarily comes from the Sun, which drives processes like weather patterns, ocean currents, and the water cycle through solar radiation. Some energy also comes from the Earth's internal heat, which fuels processes like plate tectonics and volcanism.
What is earths surface much covered by?
Earth's surface is mainly covered by water, with approximately 71% of the planet's surface covered by oceans. Landmasses, including continents and islands, make up the remaining 29% of Earth's surface.
Do magnets have the same properties as sedimentary rocks do?
No, magnets and sedimentary rocks have different properties. Magnets have the property of attracting certain materials like iron, while sedimentary rocks are formed through the deposition and compaction of sediment over time. Sedimentary rocks do not exhibit magnetic properties unless magnetic minerals are present in their composition.
Why do you think it took so long for scientists to accept the idea of continental drift?
The theory of continental drift was originated by Abraham Ortelius in 1596 and further developed by Alfred Wegener, a German geophysicist and meteorologist, around 1912. The theory is supported by 3 types of physical evidence:
- The fossils of some identical animals and plants were recovered from different continents. However scientific studies showed that these animals and plants could not have survived in all of these different climates. Some scientists objected saying that the animal or plant could have floated across the ocean to another continent. However, they were proved wrong when further research proved that the animals and plants would have dehydrated in the salt water.
- Some mountain ranges can be connected across continents. For example, the Appalachian Mountains can be traced from as far south as Georgia, all the way to Greenland, and to the Caledonian mountains of Europe. These mountains were formed during the same geologic period and were a single mountain chain.
- The final piece of evidence was the connection of coal fields. Some coal fields connected together so perfectly that it was undeniable that the now broken coal fields were once in a single location. For example, on the east coast of South America and the west coast of Africa there are coal fields that fit together like puzzle pieces, indicating that the Atlantic did not always separate the two.
Later corroboration of drift came with the investigation of mid-ocean ridges, which spread as the continents move apart. At the ocean borders, the heavy oceanic crust is subducted under the continental plates, which imparts motion to the continents. The theory of plate tectonics, developed in the 1950's, finally suggested what force was moving the continents around.
What mineral would halite be able to scratch?
Halite can scratch gypsum, which has a Mohs hardness of 2.5 on the Mohs scale. Halite has a hardness of 2.5, so it can scratch any mineral with a hardness lower than 2.5.
A parasitic cone is a small volcanic cone that forms on the flanks of a larger volcano. These cones are usually aligned with the main vent and form as a result of secondary eruptions of lava and ash from separate vents on the volcano's slope. They are often temporary features that can become inactive once the main volcano stops erupting.
What is a vertical section through all of the soil horizon is called?
A vertical section through all of the soil horizons is called a soil profile.
What is one way the earth's surface could rapidly change?
One way the Earth's surface could rapidly change is through a volcanic eruption. Volcanic eruptions can release a large amount of lava, ash, and gases, reshaping the landscape and creating new landforms in a short period of time.
What is the composition of the spinning outer core of metallic liquid?
The spinning outer core of Earth is composed primarily of iron and nickel, with smaller amounts of other elements such as sulfur and oxygen. This molten metallic liquid outer core is responsible for generating Earth's magnetic field through the movement of the conductive material.
What does a being as old as the earth mean?
A being as old as the earth typically refers to something that has existed for a very long time, potentially since the earth was formed. It implies a deep connection to the planet and a vast amount of experience and wisdom. Entities described as such are often associated with primordial or ancient energies.
How does a jetty prevent beach erosion?
A jetty helps prevent beach erosion by reducing the energy of the waves hitting the shore. It creates a barrier that dissipates wave energy and prevents the movement of sediment along the coast, helping to maintain the beach and shoreline.
What does revolution of the earth and the tilting on its axis cause?
The revolution of the Earth causes changes in seasons, as different parts of the planet receive varying amounts of sunlight throughout the year. The tilt of the Earth on its axis is responsible for the changing angle at which sunlight hits the Earth's surface, creating the seasons and affecting temperatures around the globe.
In radiometric dating for what kinds of geologic samples containing uranium is uranium most useful?
Uranium is most useful for radiometric dating in igneous rocks, such as granite or basalt, and in metamorphic rocks that have undergone high temperature events. These types of rocks are typically rich in uranium and provide reliable age information for geologists. Sedimentary rocks are generally less suitable for uranium dating due to the potential for uranium to be remobilized.
Why Seafloor spreading is occurring at the boundary between the?
Seafloor spreading occurs at the boundary between tectonic plates because of the divergent movement of these plates. As the plates move apart, magma rises from the mantle to fill the gap, solidifying as it cools and creating new seafloor. This process is instrumental in the formation of mid-ocean ridges and plays a key role in the theory of plate tectonics.
What is a bowl-shaped depression at the head of a glacial valley called?
A bowl-shaped depression at the head of a glacial valley is called a cirque or a corrie. It is typically formed by the erosion of a glacier.
Wegener's background as a climatologist helped him notice similar fossil and rock formations, as well as ancient climates, on continents that are now separated by oceans. This led him to propose the theory of continental drift, suggesting that the continents were once joined together and have since drifted apart.
What is the angle of insolation in New York?
The angle of insolation in New York varies throughout the year due to the tilt of the Earth's axis. In summer, the angle is higher, resulting in more direct sunlight and warmer temperatures. In winter, the angle is lower, leading to less direct sunlight and cooler temperatures.
The west coast of the US lies along the Pacific Ring of Fire, where several tectonic plates meet. This intense tectonic activity results in volcanic eruptions and earthquakes. In contrast, the east coast is located further away from these tectonic plate boundaries, leading to fewer volcanic and seismic events.
What set of conditions allows liquid water to exist on Earth?
For liquid water to exist on Earth, the planet's surface temperature needs to be within a certain range to keep water in its liquid state. Additionally, Earth's atmosphere plays a crucial role in maintaining the right conditions for liquid water by regulating the temperature and pressure. The presence of Earth's magnetic field also helps protect water from being stripped away by solar winds.
What is the uppermost layer of dirt?
The uppermost layer of dirt is typically called topsoil. It is the outermost layer of soil that is rich in organic matter and nutrients, making it ideal for plant growth.
What are two possible explanations for a missing layer in a rock layer sequence?
A missing layer in a rock layer sequence could be due to erosion or non-deposition. Erosion may have removed the layer after it was formed, while non-deposition indicates that the layer was never deposited in that particular location.
Sandstone is known to have a porosity of around 22%. In 50 liters of sandstone with 22% porosity, there could be approximately 11 liters of fluid present (50 L * 0.22).
What minerals are valued by beauty and rarity?
Some minerals valued for their beauty and rarity include diamonds, emeralds, and sapphires. These gemstones are highly sought after for their distinctive colors, clarity, and unique qualities. Additionally, mineral specimens like rhodochrosite, benitoite, and jeremejevite are prized by collectors for their scarcity and aesthetic appeal.
Is there a layer of limestone at the bottom of a Kettle?
Kettles are glacial landforms that form when a block of ice is left behind by a retreating glacier and then melts. The presence of limestone at the bottom of a kettle would depend on the local geology of the area where the kettle formed. If the area has limestone deposits, it is possible for a kettle to have a layer of limestone at its bottom.
The arrows shown in the asthenosphere represent the inferred slow circulation of the plastic mantle by a process called mantle convection. This process involves the movement of heat from the Earth's core towards the surface, creating a pattern of circulation that drives plate tectonics and other geologic phenomena.
