Hollows

Definition

Hollows are shallow, irregular depressions found on the surface of Mercury, typically less than a few kilometers in depth. They are a unique geological feature that provides insights into the planet's geological history and evolution. Hollows are distinct from craters, which are the result of meteorite impacts, and are believed to have formed through different processes, such as the sublimation of volatile materials from the surface or the collapse of underground structures.

5 Must Know Facts For Your Next Test

1. Hollows are typically found in areas with high radar reflectivity, suggesting the presence of exposed, fine-grained materials on the surface.
2. The formation of hollows is believed to be related to the sublimation of volatile materials, such as sulfur compounds, from the surface of Mercury.
3. Hollows are often found in association with impact craters, suggesting that the impact event may have exposed or liberated the volatile materials that led to their formation.
4. The size and distribution of hollows on Mercury's surface can provide clues about the planet's geological history and the processes that have shaped its surface over time.
5. Hollows are a relatively recent discovery on Mercury, having first been observed by the MESSENGER spacecraft during its orbital mission around the planet.

Review Questions

• Describe the key characteristics of hollows on the surface of Mercury.
  • Hollows on Mercury are shallow, irregular depressions that are typically less than a few kilometers in depth. They are distinct from impact craters and are believed to have formed through the sublimation of volatile materials, such as sulfur compounds, from the surface. Hollows are often found in areas with high radar reflectivity, suggesting the presence of exposed, fine-grained materials on the surface.
• Explain the relationship between hollows and the geological history of Mercury.
  • The formation and distribution of hollows on Mercury's surface can provide important clues about the planet's geological history and the processes that have shaped its surface over time. The association of hollows with impact craters suggests that the impact events may have exposed or liberated the volatile materials that led to their formation. Additionally, the size and distribution of hollows can help scientists understand the nature and extent of volatile materials on the planet, as well as the processes that have caused their sublimation and the subsequent formation of these unique geological features.
• Analyze the significance of the discovery of hollows on Mercury and how it has contributed to our understanding of the planet's evolution.
  • The discovery of hollows on the surface of Mercury, a relatively recent finding, has significantly advanced our understanding of the planet's geological history and evolution. These unique features provide insights into the presence and behavior of volatile materials on the planet, which were previously not well understood. The study of hollows has allowed scientists to better comprehend the processes that have shaped Mercury's surface, such as the sublimation of volatile substances and the potential role of impact events in exposing and liberating these materials. Furthermore, the characteristics and distribution of hollows can help researchers piece together a more complete picture of Mercury's geological history, shedding light on the complex interplay of various processes that have contributed to the planet's current state.

Related terms

Sublimation: The process by which a solid substance transitions directly into a gaseous state, bypassing the liquid phase.

Volatile Materials: Substances that are easily vaporized at relatively low temperatures, such as water ice or sulfur compounds.

Radar Reflectivity: The ability of a surface to reflect radar signals, which can be used to infer the properties of the surface material.