<span>In terms of matter and resources, the Earth is essentially a closed system, because matter and resources are fixed.
</span>In terms of energy, the Earth is an open system, because there is a balanced transfer of energy. (The energy<span> radiates into the </span>Earth's system<span>, from the Sun and</span><span> then it is radiated back into space from the </span>Earth. The<span> flows of energy are regulated by the </span>Earth's<span> atmosphere and ozone layer.)</span>
Answer:
La opción correcta es C. Los lagos son ideales para la construcción de centrales hidroeléctricas.
Explanation:
Una central hidroeléctrica es una central eléctrica que utiliza agua corriente o que cae para poner una turbina en movimiento y generar electricidad a través de este. El uso de energía hidroeléctrica no produce contaminación ni residuos radiactivos peligrosos. Por eso se considera que las centrales hidroeléctricas generan energía verde.
En este contexto, los lagos son fundamentales para la construcción de las represas que almacenan el agua que se utiliza para hacer funcionar las centrales hidroeléctricas, ya que en el caso de los ríos, muchas veces ocurre que el ancho del caudal no es suficiente para poder realizar una construcción efectiva, con lo cual se construyen embalses artificiales que son un gasto extra de tiempo y dinero.
Answer:
B.) Red Volcanic Rock
C.) Lava Rock covered by Sulphur
Explanation:
Igneous rocks are rocks that forms from the cooling and solidification of magma. Magma is a melt or molten rock. Magma is usually derived from rocks that have been buried and subjected to extreme temperature conditions.
Red volcanic rocks and lava rocks covered with sulphur are classified as volcanic rocks. Volcanic rocks are formed from magma that settles and cools on the surface of the crust. These magma is called lava.
Slate is a metamorphic rock and sandstones are sedimentary in nature.
The answer for your question is c
They are the only mammals capable of self-powered flight, but they’re by no means rare. Bats account for about one in five of all mammals living on the planet and there are around 1,300 bat species worldwide. They are, however, threatened by loss of natural habitat and hunting, and many species of bat are considered endangered or threatened.
Though they’re the only mammals to have developed the ability to fly, they’re extremely good at it. The Mexican free-tailed bat can achieve speeds up to 99 miles per hour in the air and fly as high as 10,000 feet, as high as a bald eagle.
They’re the only flying mammals and are extremely diverse
