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Una palanca es una máquina simple. Las máquinas simples facilitan el trabajo. Usamos la palanca muchas veces sin darnos cuenta porque es muy sencilla. Las palancas nos ayudan a levantar cargas pesadas, a abrir una botella y ¡divierten a los niños! ¿Qué más pueden hacer las palancas?
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La rueda es una máquina simple. Una máquina es cualquier herramienta o aparato que facilita el trabajo. Las ruedas giran alrededor de un eje. Un eje es una barra de metal o varilla que pasa por el centro de la rueda. Las llantas de los carros, los camiones o los autobuses giran alrededor de un eje. Las ruedas nos permiten movernos más rápido de un lugar a otro. ¿Qué más pueden hacer las ruedas y los ejes?
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As Zak Nine and his friend Erro make their way around a strange lake, they discover an ancient golden building. The boys decide to go inside to take a closer look, but unwittingly stumble into the legendary Octagon: an underground chamber with eight mysterious doors. One door will lead the boys to freedom, but the rest lead to sinister traps and certain death! Will Zak and Erro outwit the deadly room and escape before it's too late?
8) Terror Wood
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Erro and Zak Nine are hiding in the Phantom Forest, a dark wood filled with giant, towering trees and dangerous beasts. The boys hide high above the ground, climbing and jumping between the tree branches. So far they've avoided dangerous creatures such as huge, hairy rats and giant, bloodthirsty spiders. But a new predator has caught the boys' scent. An enormous flying serpent chases after them and won't stop until its hunger is satisfied! How will...
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Traveling by night, Zak Nine and Erro are following a shadowy figure until the mysterious stranger disappears into a cave. The boys decide to follow. Inside they find a maze filled with priceless gems, along with a rough band of escaped criminals. Things go from bad to worse when a squad of Alcatraz guards arrives on the scene. When the guards start shooting their laser blasters, suddenly nobody is safe! Will Zak and Erro escape the deadly storm of...
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Hoping to avoid the Alcatraz guards, Zak Nine and Erro decide to climb down into a deep canyon to hide. But soon the boys see some huge rock formations that move! Zak and Erro are quickly caught by the giant criminals that have been imprisoned in the deep gorge. Some of the giants want to hand the boys over to the Alcatraz guards to gain their own freedom. But a few giants would rather turn the boys into dinner! Will Zak and Erro outwit their captors...
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Zak Nine has been captured and placed in Planet Alcatraz's "Monster Zoo." But this isn't any ordinary zoo. This zoo holds dozens of alien "monsters" who are forced to fight for the entertainment of the prison planet's owners. Zak's friend, Erro, is determined to break into the zoo to rescue the human boy. Erro will need to rely on his Quom survival skills to succeed. Will he be able to find Zak, avoid the zoo's Overseers, and find a way out?
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Zak Nine and his Quom friend, Erro, are desperate to get off planet Alcatraz. The boys believe they've finally found a way to freedom when they join up with another prisoner. Together with their new partner, the boys board a small spacecraft and fly off the planet, past the metal moon, and head into space. But when the stars begin to look strange, Zak and Erro realize that something is very wrong. What will happen when the boys learn Planet Alcatraz's...
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