Results 41 to 50 of about 1,753 (119)

Fresh shallow valleys in the Martian midlatitudes as features formed by meltwater flow beneath ice [PDF]

open access: yes, 2014
Significant numbers of valleys have been identified in the Martian midlatitudes (30–60°N/S), spatially associated with extant or recent ice accumulations.
Hobley, Daniel E. J.   +2 more
core   +1 more source

Morphology of Antarctic Polygons and Implications for Polygon Evolution and Subsurface Ice Dynamics

open access: yesPermafrost and Periglacial Processes, Volume 37, Issue 1, Page 143-153, January/March 2026.
ABSTRACT Polygonal terrain results from thermal contraction, is commonly found in periglacial environments, and serves as a valuable proxy for interpreting subsurface ice distribution and climate history on Earth and Mars. In this study, we investigate the morphology of polygons in Beacon Valley, Antarctica, to assess the relationship between polygon ...
Rachael H. Hoover   +4 more
wiley   +1 more source

Raised beach deposits and the distribution of structural lineaments on Macquarie Island [PDF]

open access: yes, 1984
The distribution of previously-unmapped raised beaches on Macquarie Island makes it difficult to accept earlier interpretations of landform evolution.
Ledingham, R, Peterson, JA
core   +2 more sources

Significant achievements in the planetary geology program, 1981 [PDF]

open access: yes
Recent developments in planetology research as reported at the 1981 NASA Planetary Geology Principal Investigators meeting are summarized. The evolution of the solar system, comparative planetology, and geologic processes active on other planets are ...
Holt, H. E.
core   +1 more source

Quaternary volcanism, tephras, and tephra-derived soils in New Zealand: an introductory review [PDF]

open access: yes, 2010
This two-part article comprises brief introductions to (1) volcanism and its products in general and to the broad pattern of Quaternary volcanism and tephrostratigraphy in North Island, and (2) the ensuing tephra-derived soils of North Island.
Lowe, David J.
core   +1 more source

Constructional Volcanic Edifices on Mercury: Candidates and Hypotheses of Formation [PDF]

open access: yes, 2018
Mercury, a planet with a predominantly volcanic crust, has perplexingly few, if any, constructional volcanic edifices, despite their common occurrence on other solar system bodies with volcanic histories.
Balme, Matthew R.   +3 more
core   +3 more sources

Weathering and erosion of the polar layered deposits on Mars [PDF]

open access: yes
The Martial polar layered deposits are widely believed to be composed of water ice and silicates, but the relative amount of each component is unknown. The conventional wisdom among Mars researchers is that the deposits were formed by periodic variations
Herkenhoff, K. E.
core   +1 more source

Methane release on Early Mars by atmospheric collapse and atmospheric reinflation [PDF]

open access: yes, 2019
A candidate explanation for Early Mars rivers is atmospheric warming due to surface release of H$_2$ or CH$_4$ gas. However, it remains unknown how much gas could be released in a single event.
Gao, Peter   +4 more
core   +1 more source

Transfer function-noise modeling and spatial interpolation to evaluate the risk of extreme (shallow) water-table levels in the Brazilian Cerrados [PDF]

open access: yes
Water regimes in the Brazilian Cerrados are sensitive to climatological disturbances and human intervention. The risk that critical water-table levels are exceeded over long periods of time can be estimated by applying stochastic methods in modeling the ...
Asmuth, J.R., von   +4 more
core   +2 more sources

Geoscience and a Lunar Base: A Comprehensive Plan for Lunar Exploration [PDF]

open access: yes
This document represents the proceedings of the Workshop on Geoscience from a Lunar Base. It describes a comprehensive plan for the geologic exploration of the Moon.
Spudis, Paul D., Taylor, G. Jeffrey
core   +1 more source

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