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Fossil fuels are carbon-based energy sources like coal, oil and natural gas created from decayed plants and sea creatures that accumulated in the oceans. A biofuel is any fuel that's made from plant materials
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Hail actually falls as a solid. Hailstones are formed by layers of water attaching and freezing in a large cloud. A frozen droplet begins to fall from a cloud during a storm, but is pushed back up into the cloud by a strong updraft of wind. When the hailstone is lifted, it hits liquid water droplets
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More efficient use of agricultural land can boost crop yields and meet growing global demand for food. Smallholders have a vital role to play, both because they produce much of the world's food and because they represent a large share of the world's poor and food insecure.
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An open circuit is one where the continuity has been broken by an interruption in the path for current to flow. A closed circuit is one that is complete, with good continuity throughout.
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For instance, a simple light switch opens and closes the circuit that connects a light to a power source. When you build a circuit, it's a good idea to disconnect the battery or other power source when the circuit is not in use.
Rock layers can be dated using radiometric dating because it can change how we think about them. This allows us to determine the relative ages of these rock layers.
Rock is a naturally occurring, cohesive aggregation of one or more minerals in geology. These aggregates often form recognisable and mappable volumes and make up the fundamental component of the solid Earth. According to the processes that led to their formation, rocks are typically categorized into three major classes.
These three categories of rocks are: (1) igneous rocks, which have crystallized from molten rock known as magma; (2) sedimentary rocks, which are made up of pieces of other rocks or of substances that have precipitated from solutions; and (3) metamorphic rocks, which have been created from either igneous or sedimentary rocks under conditions that have changed their mineralogical composition, texture, and internal structure. These three classes are further divided into multiple groups and types based on a variety of variables.
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