{ "title": "Layers in Western Arabia Terra", "authors": "HiRISE", "metadata": { "thumbnailURL": "https://static.uahirise.org/anews/2020-10-12/ESP_027747_1820.jpg", "excerpt": "Layers exposed on the sides of hills in this picture are visible as terraced steps in this stunning image." }, "version": "1.5", "identifier": "ESP_027747_1820", "language": "en", "layout": { "columns": 10, "width": 1024, "margin": 85, "gutter": 20 }, "documentStyle": { "backgroundColor": "#faf7f2" }, "components": [ { "role": "heading1", "layout": "heading1Layout", "text": "HiPOD: 12 October 2020" }, { "role": "divider", "layout": "bigDividerLayout", "stroke": { "width": 3, "color": "#8c2028" } }, { "role": "title", "layout": "halfMarginBelowLayout", "text": "Layers in Western Arabia Terra" }, { "role": "photo", "layout": "fullBleedLayout", "caption": "The formation of these steps is a result in differences between layers in cohesion and resistance to weathering. Less than 5 km across. (NASA/JPL/UArizona)", "URL": "https://static.uahirise.org/anews/2020-10-12/ESP_027747_1820.jpg" }, { "role": "body", "format": "html", "layout": "hipodMarginLayout", "text": "


Layers exposed on the sides of hills in this picture are visible as terraced steps. The formation of these steps is a result in differences between layers in cohesion and resistance to weathering. Weaker layers disaggregate quickly into shallow slopes, while stronger layers maintain steep, “sharp” appearing edges. Such contrast can occur, for example, between alternating strong lava flows and weak volcanic ash deposits.

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Between the hills, dark sands blow across the landscape and have accumulated in hollows created by these differences in rock strength. Since the hollows tend to follow weaker layers, they outline the layer exposure, even when the topography of the hollows are too subtle to see on its own.

" }, { "role": "photo", "layout": "fullBleedLayout", "caption": "An enhanced color cutout. Less than 1 km across. (NASA/JPL/UArizona)", "URL": "https://static.uahirise.org/anews/2020-10-12/ESP_027747_1820-2.jpg" }, { "role": "body", "format": "html", "layout": "hipodMarginLayout", "text": "


ID: ESP_027747_1820
date: 27 June 2012
altitude: 272 km

NASA/JPL/UArizona

" }, { "role": "caption", "format": "html", "layout": "halfMarginBothLayout", "text": "Enhanced color image is less than 1 km across; black and white is less than 5 km. For full images with scalebars, see the above ID link to our website.

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