Answer:
Option (A)
Explanation:
The lithosphere represents the rigid outer shell of the Earth, exhibiting brittleness that leads to the fracture of rocks upon deformation. It comprises numerous tectonic plates categorized into two types: the oceanic and continental crusts.
These plates float atop the less dense asthenosphere due to convection currents generated within the mantle. The heat from the Earth's interior causes this current. The movement of plates across the asthenosphere is known as the theory of plate tectonics. Therefore, the correct selection is option (A).
Given that a basketball symbolizes the Earth's scale with a diameter of 23 cm, and considering that the Moon is approximately one-quarter the size of Earth—more accurately, 27%—the ball representing the Moon would have a diameter of 6 cm.
The approximate distance from Earth to the Moon is about 30 times the Earth's diameter, specifically 30.17 times, making the separation between the two balls, illustrating Earth and the Moon, around 694 cm.
The applicable answers include;
- Movement of galaxies
- The Sun's chemical makeup.
The speed of light and the duration it takes to travel between various points in the universe allows scientists to estimate the ages of distant stars and galaxies. Due to the expansive scale of the universe, it takes years for light to journey from one galaxy to another. Understanding the light's speed and the time taken for it to travel from a remote celestial object, alongside geometric calculations and brightness assessments, enables us to approximate the celestial body's age. A star's age can also be ascertained through its elemental composition. Young stars predominantly consist of lighter elements like helium, while older stars contain a greater proportion of heavier elements such as iron, resulting from the fusion of lighter elements into heavier ones at the core of the sun.
The applicable answers include;
- Radiometric dating of rocks
- Fossil evidence
- Gradual geological processes
Radiometric dating refers to employing the half-life of naturally occurring decaying elements like carbon-14 to determine the age of fossils or rocks. The slow creation of rocks, including the lithification of sedimentary rock or the transformation of rocks, is likewise used to estimate the Earth's age by examining the developmental stage of the rocks and extrapolating their age through calculations.
