Interior Of The Earth

The two kinds of crust are continental and oceanic. Continental crust is thicker and less dense, mainly composed of granite rocks, and forms the continents. Oceanic crust, on the other hand, is thinner and more dense, primarily made up of basalt rocks, and forms the ocean floors. This distinction in composition and thickness is what differentiates the two types of crust.

The correct answer is iron because it is widely accepted by scientists that the inner core of the Earth is primarily composed of iron. This is based on various pieces of evidence, such as seismic data and the behavior of Earth's magnetic field. Iron is known to have the necessary properties, such as high density and ability to withstand extreme pressure and temperature, to form the solid inner core of our planet.

There are 1,000 meters in a kilometer. This is because the prefix "kilo-" in the metric system denotes a factor of 1,000. Therefore, when converting from kilometers to meters, we multiply the number of kilometers by 1,000 to get the equivalent distance in meters.

The correct order of the Earth's layers starting from the inside and going outwards is inner core, outer core, mantle, crust. The inner core is the solid innermost layer, followed by the outer core which is a liquid layer. The mantle is the thickest layer and is composed of semi-solid rock. The crust is the outermost layer and is the thinnest layer, consisting of solid rock.

Scientists cannot dig down directly to the mantle because it is located beneath the Earth's crust, which is several kilometers thick. Therefore, they cannot physically access the mantle through digging. However, scientists can learn about the mantle by studying rocks, observing the Earth's surface, and studying the ocean floor, which can provide indirect information about the composition and behavior of the mantle.

A compound is formed when two or more elements chemically combine together. It is different from a mixture as the elements in a compound are chemically bonded, resulting in a new substance with different properties than the individual elements. Therefore, the correct answer is "two or more elements".

The statement "The inner core is liquified" is false. The inner core of the Earth is actually solid, composed mainly of iron and nickel. It is surrounded by the outer core, which is in a liquid state due to the high temperatures and pressure. The solid inner core and liquid outer core play a crucial role in generating Earth's magnetic field.

The mantle is the correct answer because it is the layer of the Earth that lies between the crust and the outer core. It is the largest layer of the Earth by volume and makes up about 84% of the Earth's total volume. The mantle is composed of solid rock that is capable of flowing slowly over long periods of time. It plays a crucial role in the movement of tectonic plates and the convection currents that drive plate tectonics.

In this sentence, the word "dense" is used to describe the elements in the core. When something is "dense," it means that it is closely compacted together, implying that the elements in the core are tightly packed.

The continental crust can indeed be up to 100km thick. This is in contrast to the oceanic crust, which is generally much thinner, around 7-10km thick. The continental crust is composed of a variety of rocks, including granite, and it is less dense than the oceanic crust. The thickness of the continental crust can vary depending on factors such as tectonic activity and the age of the crust.

The statement "It can be found beneath the ocean" is not true about continental crust. Continental crust is primarily found beneath the continents and is thicker and less dense than oceanic crust. It forms the landmasses and is up to 100km thick. However, oceanic crust is found beneath the ocean and is thinner and denser than continental crust.

The crust is the outermost layer of the Earth's surface. It is composed of solid rock and is relatively thin compared to the other layers of the Earth. The statement that the crust is less than 1% of the Earth's mass is true because the crust is much thinner and less dense than the mantle and the core. The majority of the Earth's mass is concentrated in the mantle and the core, while the crust makes up only a small fraction of the total mass of the planet.

The crust is not about 50-70km thick. The Earth's crust varies in thickness, with oceanic crust being thinner (about 5-10km) and continental crust being thicker (about 30-50km). Therefore, the given statement is false.

Oceanic crust is denser and has a different composition than continental crust. It contains more magnesium and iron-rich minerals, while continental crust has higher amounts of silica and aluminum.