Le sable est probablement la premi\u00e8re mati\u00e8re que les organismes marins ont trouv\u00e9e lorsqu'ils ont fait le premier pas d\u00e9cisif vers la terre. Utilis\u00e9 uniquement au singulier, le sable est d\u00e9j\u00e0 la d\u00e9signation d'une multiplicit\u00e9. Ce livre contient environ 70 photos de grains de sable, enti\u00e8rement sortis de leur contexte et donc du sable en tant que tel. Aucun de ces individus ne ressemble \u00e0 un autre. C'est presque trop absurde pour imaginer qu'il n'existe probablement pas deux grains de sable compl\u00e8tement identiques sur la Terre. L'\u00e9cart entre l'uniformit\u00e9 de la masse et l'individualit\u00e9 r\u00e9elle de ses composants est particuli\u00e8rement frappant si l'on consid\u00e8re que, selon les estimations, environ un milliard de grains de sable sont cr\u00e9\u00e9s chaque seconde sur la Terre par des processus \u00e9rosifs.
\nEt comment le grain de sable devient-il rond ?
\nLe sable suit le diktat de la gravit\u00e9. Il est transport\u00e9 par l'eau, la glace ou le vent et se d\u00e9pose couche par couche depuis les c\u00f4tes maritimes, en passant par les bords des plateaux continentaux, dans les grands bassins des eaux profondes. C'est ainsi que se forment, en des millions d'ann\u00e9es, des paquets de couches de plusieurs kilom\u00e8tres d'\u00e9paisseur, compos\u00e9s de masses d'abord meubles, qui sont ensuite progressivement compact\u00e9es et agglom\u00e9r\u00e9es. Des montagnes enti\u00e8res, \u00e9rod\u00e9es par l'inexorable \u00e9rosion, se retrouvent finalement dans de telles couches de s\u00e9diments. Les nouvelles roches ainsi form\u00e9es dans les d\u00e9pressions sont \u00e0 leur tour d\u00e9plac\u00e9es par les processus de la tectonique des plaques et pliss\u00e9es en montagnes, o\u00f9 elles sont \u00e0 nouveau soumises \u00e0 l'\u00e9rosion et \u00e9rod\u00e9es. Un grain lib\u00e9r\u00e9 du gr\u00e8s sur la cr\u00eate est emport\u00e9 vers la vall\u00e9e et le cycle recommence. Cycle apr\u00e8s cycle, le grain s'arrondit. Selon des estimations approximatives, chaque cycle peut durer environ 200 millions d'ann\u00e9es. De petits grains tr\u00e8s bien arrondis pourraient ainsi avoir travers\u00e9 sept cycles d'une dur\u00e9e totale de 1,5 milliard d'ann\u00e9es.
\nReste \u00e0 savoir s'il y a plus de grains de sable que d'\u00e9toiles ?
\nNon, au-dessus de 85,7 quadrillions de grains de sable sur la Terre s'\u00e9tend un ciel de 70 trillions d'\u00e9toiles.<\/p>","protected":false},"excerpt":{"rendered":"
Texte (all.\/ang.) de Oliver Lenzen
\n96 p. avec 150 illustrations en couleur
\nformat 21 x 31 cm, couverture souple<\/p>","protected":false},"featured_media":5147,"template":"","meta":[],"product_brand":[],"product_cat":[95],"product_tag":[],"class_list":{"0":"post-3732","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-vergriffen","8":"first","9":"outofstock","10":"taxable","11":"shipping-taxable","12":"product-type-simple"},"aioseo_notices":[],"_wp_attached_file":null,"_wp_attachment_metadata":null,"_wc_attachment_source":null,"_elementor_inline_svg":null,"_elementor_is_screenshot":null,"_elementor_source_image_hash":null,"_source_url":null,"_wp_attachment_context":null,"_menu_item_type":null,"_menu_item_menu_item_parent":null,"_menu_item_object_id":null,"_menu_item_object":null,"_menu_item_target":null,"_menu_item_classes":null,"_menu_item_xfn":null,"_menu_item_url":null,"__elementor_forms_snapshot":null,"_unit":"","_unit_base":"","_unit_product":"","_unit_price_auto":"no","_unit_price_regular":"","_unit_price":"","_unit_price_sale":"","_sale_price_label":"","_sale_price_regular_label":"","_manufacturer_slug":"","_mini_desc":"","_defect_description":"","_safety_instructions":"","_allergen_ids":[],"_warranty_attachment_id":"","_safety_attachment_ids":[],"_min_age":"","_ts_gtin":"","_ts_mpn":"","_delivery_time_countries":[],"_free_shipping":"no","_service":"no","_photovoltaic_system":"no","_used_good":"no","_defective_copy":"no","_wireless_electronic_device":"no","_device_contains_power_supply":"no","_device_charging_supports_usb_pd":"no","_device_charging_watt_min":"0","_device_charging_watt_max":"0","_is_food":"no","_differential_taxation":"no","_gzd_version":"3.18.7","_hs_code":"","_customs_description":"","_manufacture_country":"0","_is_non_returnable":"no","_shipping_length":"","_shipping_width":"","_shipping_height":"","_sku":"ISBN 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