La arena fue probablemente el primer material que encontraron los organismos marinos cuando dieron el decisivo primer paso hacia tierra firme. Utilizada s\u00f3lo en singular, la arena es ya el nombre de una multiplicidad. En este libro se pueden encontrar unas 70 fotograf\u00edas de granos de arena, completamente desprendidos de su contexto, alejados por tanto de la arena como tal. No hay dos iguales. Es casi demasiado absurdo imaginar que probablemente no haya dos granos de arena completamente id\u00e9nticos en la Tierra. La discrepancia entre la uniformidad de la masa y la individualidad real de sus componentes resulta especialmente llamativa si se tiene en cuenta que, seg\u00fan las estimaciones, cada segundo se forman en la Tierra unos mil millones de nuevos granos de arena a trav\u00e9s de procesos erosivos.
\n\u00bfY c\u00f3mo se vuelve redondo el grano de arena?
\nLa arena sigue los dictados de la gravedad. Es transportada por el agua, el hielo o el viento y depositada capa a capa desde las costas marinas por los bordes de las plataformas continentales hasta las grandes cuencas de las profundidades marinas. De este modo, a lo largo de millones de a\u00f1os, se forman paquetes de capas de un grosor kilom\u00e9trico a partir de masas inicialmente sueltas, que luego se compactan y apelmazan gradualmente. En esas capas de sedimentos se encuentran, en \u00faltima instancia, cordilleras enteras eliminadas por la imparable erosi\u00f3n. A su vez, las rocas reci\u00e9n formadas de este modo en las depresiones son desplazadas por los procesos de tect\u00f3nica de placas y plegadas en monta\u00f1as, donde vuelven a ser sometidas a la erosi\u00f3n y eliminadas. Un grano desprendido de la arenisca de la cresta es arrastrado hasta el valle y el ciclo vuelve a empezar. Ciclo tras ciclo, el grano se redondea. Seg\u00fan estimaciones aproximadas, cada ciclo dura unos 200 millones de a\u00f1os. Peque\u00f1os granos muy redondeados podr\u00edan haber pasado por siete ciclos de esta forma, lo que supone un total de 1.500 millones de a\u00f1os.
\nLa pregunta sigue siendo: \u00bfhay m\u00e1s granos de arena que estrellas?
\nNo, un cielo con 70 billones de estrellas abarca 85,7 cuatrillones de granos de arena en la Tierra.<\/p>","protected":false},"excerpt":{"rendered":"
Texto (alem\u00e1n\/ingl\u00e9s) de Oliver Lenzen
\n96 p. con 150 ilustraciones en color
\nFormato 21 x 31 cm, tapa blanda<\/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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