The appropriate answer is a. the temperature is high enough but pressure low enough to melt iron. The earth's core is composed of two layers; the inner and outer core. Both layers are composed mainly of iron and nickel. The main difference between the two layers is that the inner core is solid and the outer core is liquid. The inner core is solid because of the pressure created by the overlaying layers; the outer core, mantle and the crust. The inner core is however hotter than the outer core.
The greenhouse effect is related to the increase in the average surface temperature which is considered "global warming". Global warming is the result of an increase in gases like methane, carbon dioxide, and other factors that lead to a rise in the planet's temperature.
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Gaining stream describes a stream which receives water through the inflow of groundwater through the stream bed.
Groundwater that enters a gaining stream is coming from a saturated zone. Gaining stream channels are typically at or below the water table level. When the water table crosses the land surface over a large, relatively flat area, bodies of water and marshes are formed.
The channels of gaining streams are usually at or below the level of the water table. Bodies of water and marshes form when the water table intersects the land surface over a broad, fairly flat area.
"Gaining stream," which typically draws water from the earth. The term "losing streams" refers to streams that leak water into the earth from the streambed. Rivers can grow and shrink in different places; they can grow at one point in the year and shrink at another. Additionally, even a stream that is growing will be losing some water, as the yellow arrow illustrates, and vice versa.
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