Geo Quiz (6) .. The Last Quiz In This Semester

Explanation
The mantle is the layer of the Earth that is both liquid and solid. It is located between the crust and the outer core. The upper part of the mantle is solid rock, while the lower part is semi-fluid and behaves like a thick liquid. This unique characteristic of the mantle is due to the intense heat and pressure present in this layer of the Earth.

Explanation
The dense metallic layer of the Earth refers to the inner core. The inner core is the innermost layer of the Earth, located beneath the outer core. It is primarily composed of solid iron and nickel, and has a high density due to the immense pressure at the Earth's center. The inner core is responsible for generating Earth's magnetic field and plays a crucial role in the dynamics of the planet.

Explanation
The correct answer is continental drift. This refers to the scientific theory that suggests that the Earth's continents have moved over time due to the movement of tectonic plates. This theory was proposed by Alfred Wegener in the early 20th century and has since been supported by evidence such as the matching shapes of continents, the distribution of fossils, and the presence of similar rock formations on different continents. Continental drift is an important concept in understanding the geological history and formation of the Earth's landmasses.

Explanation
The plates move because of convection in the mantle. The mantle is the layer of the Earth located between the crust and the core. It is composed of molten rock that circulates in a process called convection. As the molten rock heats up, it becomes less dense and rises towards the surface. As it cools down, it becomes denser and sinks back down. This convection process causes the plates on the Earth's surface to move, leading to phenomena such as earthquakes, volcanic activity, and the formation of mountains.

Explanation
As we go deeper into the earth, the velocity of seismic waves increases because the density of the material through which the waves travel also increases. This increase in velocity is due to the higher pressure exerted by the overlying layers of the earth. However, the amplitude of the waves decreases because the energy of the waves is gradually absorbed and dispersed as they propagate through the earth's layers. Therefore, the correct answer is that the velocity increases, the pressure increases, and the amplitude decreases.

Explanation
Filtering is the process of minimizing unwanted components in the data and enhancing those parts of the data that are of interest. It is used to remove noise or unwanted signals from a dataset, allowing for a clearer representation of the desired information. Filtering techniques can be applied in various fields such as signal processing, image processing, and data analysis to improve the quality and reliability of the data.