What is basalt quizlet astronomy?
Basalt, a dense congealed lava rock rich in iron is the primary material in the Moon's. Maria. One result of bombardment on the Moon's surface is a layer of broken, pulverized, and powered rock called. Regolith.
Why is the Moon’s surface cratered but the Earth’s is not?
Why does the Moon have so many craters while Earth has so few? On Earth, impact craters are harder to recognize because of weathering and erosion of its surface. The Moon lacks water, an atmosphere, and tectonic activity, three forces that erode Earth's surface and erase all but the most recent impacts.
When our Earth becomes tidally locked with the Moon which of the following statements will be true?
When our Earth becomes tidally locked with the Moon, which of the following statements will be true? –The Moon will always be visible only from one side of the Earth.
What rock type are the lunar highlands composed of?
The maria are composed predominantly of basalt, whereas the highland regions are iron-poor and composed primarily of anorthosite, a rock composed primarily of calcium-rich plagioclase feldspar.
What material are the dark spots on the moon made from quizlet?
Maria is composed of basalt. Basalt is dark and rich in iron, magnesium, and titanium silicates.
Which two geological processes have been most important in shaping the surface of the moon as we see it today?
The primary geologic processes that shaped the moon are the formation of craters, volcanic activity, and tectonic activity. Each of these will be dealt with in their respective sections below. Craters cover the surface of the moon. They are the result of high velocity impacts on the surface by meteorites.
What is the Moon’s surface made out of?
The average composition of the lunar surface by weight is roughly 43% oxygen, 20% silicon, 19% magnesium, 10% iron, 3% calcium, 3% aluminum, 0.42% chromium, 0.18% titanium and 0.12% manganese.
What is the primary cause of erosion on the Moon?
What is the primary cause of erosion on the Moon? Meteoroid impacts have battered the surface of the Moon for billions of years and are the primary cause of erosion.
When you observe the Moon from Earth you always see the same side this implies that the Moon?
The Moon orbits Earth once every 27.3 days and spins on its axis once every 27.3 days. This means that although the Moon is rotating, it always keeps one face toward us. Known as “synchronous rotation,” this is why we only ever see the Moon's nearside from Earth.
Which of the following hypotheses for the origins of the moon is generally accepted by astronomers?
Which of the following hypotheses for the origins of the Moon is generally accepted by astronomers? The Moon is the result of a collision between the Earth and a Mars-sized object in the early days of the solar system (the collision theory).
Is the Moon made of basalt?
The lunar maria are made of layers of basaltic lava, not unlike the basaltic flows of the Columbia River Plateau or of Iceland. The orange glass found on the Moon's surface is another product of volcanic activity. Moon rocks are not exposed to weather nor are they eroded by wind, water, or ice.
Where is basalt found on the Moon?
Basalt: The Mare Rock Black volcanic basalts are found on 26% of the Moon's near side (and 2% of the Moon's far side).
What type of rock on the Moon would most likely be found in a maria?
The Maria are mostly composed of dark basalts, which form from rapid cooling of molten rock from massive lava flows. The Highlands rocks are largely Anorthosite, which is a kind of igneous rock that forms when lava cools more slowly than in the case of basalts.
What is the Moon’s mantle made of?
The lunar mantle extends up to a distance of only 50 km below the surface of the Moon. Scientists believe that the mantle of the Moon is largely composed of the minerals olivine, orthopyroxene and clinopyroxene. It's also believed to be more iron-rich than the Earth's mantle.
What are two geological features that appear to set Earth apart from all the other terrestrial worlds?
What are the two geological features that appear to set Earth apart from all the other terrestrial worlds? Plate tectonics and widespread erosion. neither of these features appears to exist on any terrestrial world in our solar system.
Which of the following statement can explain the reason that Earth’s continental crust has lower density than seafloor crust?
Why is continental crust lower in density than seafloor crust? Continental crust is made from remelted seafloor crust and therefore only the lower-density material rises to form it. How fast do plates move on Earth? one plate slides under another, returning older crust to the mantle.
Is the Moon made of iron?
At the center is the Moon's dense, metallic core. The core is largely composed of iron and some nickel. The inner core is a solid mass about 480 km in diameter. Surrounding the solid inner core is a fluid outer core, that brings the total diameter of the core to about 660 km.
What is the surface of the Moon called?
The surface of the moon is divided into lunar terrae and lunar maria. Lunar maria formed due to volcanic flow that occurred billions of years ago.
What is the Moon’s crust made of?
In terms of elements, the lunar crust is composed primarily of oxygen, silicon, magnesium, iron, calcium, and aluminium, but important minor and trace elements such as titanium, uranium, thorium, potassium, and hydrogen are present as well.
What is the Moon’s surface made of?
The average composition of the lunar surface by weight is roughly 43% oxygen, 20% silicon, 19% magnesium, 10% iron, 3% calcium, 3% aluminum, 0.42% chromium, 0.18% titanium and 0.12% manganese.
Why do you always see the same face of the Moon Class 6?
It takes approximately 27 days for the moon to complete 1 revolution around the earth and it takes the same amount of time for it to complete 1 rotation on its own axis. As a result of this, we always see the same face of the moon.
What is retrograde motion in regards to planets like Mars and Jupiter quizlet?
retrograde motion is the apparent motion of a planet in a direction opposite to that of other bodies within its system.
What is the primary method used to determine how the Moon formed?
The prevailing theory supported by the scientific community, the giant impact hypothesis suggests that the moon formed when an object smashed into early Earth. Like the other planets, Earth formed from the leftover cloud of dust and gas orbiting the young sun.
How does the great impact hypothesis explain the differences in density between the Earth and the Moon?
The Moon has a relatively small iron core. This gives the Moon a lower density than Earth. Computer models of a giant impact of a Mars-sized body with Earth indicate the impactor's core would likely penetrate Earth and fuse with its own core.
What kinds of rocks are found in the lunar maria?
Lunar Rocks Four of the Apollo missions landed on the mare plains and returned samples of mare volcanic rocks. The lunar mare rocks are basalts similar in texture and chemical composition to volcanic basaltic rocks on the earth.
What did the maria on the Moon most likely form from?
Planetary Satellites, Natural The result was the melting and eruption of basaltic lava onto the lunar surface between 3.8 to about 2.8 billion years ago to form the lunar maria. This lava was highly fluid under the weaker gravitational field of the Moon and spread over vast distances.
What type of material is the Moon made of?
Like many planets in our solar system such as Mercury, Venus, and Mars, the moon is a rocky body with a combination of metallic substances found within the layers of its surface. While the moon is mostly made of iron, other metals found on the moon are magnesium, aluminum, silicon, titanium, gold, silver, and mercury.
What material is the Moon made out of?
The average composition of the lunar surface by weight is roughly 43% oxygen, 20% silicon, 19% magnesium, 10% iron, 3% calcium, 3% aluminum, 0.42% chromium, 0.18% titanium and 0.12% manganese. Orbiting spacecraft have found traces of water on the lunar surface that may have originated from deep underground.
Why do geological activities such as earthquake volcanism and mountain formation happen to be confined on certain places around the globe?
Geologic processes such as plate tectonics impact the entire surface of the planet and have major influences on the location of natural hazards like earthquakes and volcanoes. So far, we have only studied large scale patterns in plate tectonics.
When two tectonic plates collide the oceanic crust usually subducts beneath the continental crust because it is?
When an oceanic plate converges with a continental plate, the oceanic crust will always subduct under the continental crust; this is because oceanic crust is naturally denser. Convergent boundaries are commonly associated with larger earthquakes and higher volcanic activity.