Emergents, which do not form a continuous layer, are usually the giants of the forest, reaching heights of 35 to 70 m or more, and trunk sizes of over 2 m in diameter.
不形成连续层的新生植物通常是森林中的巨人，高度可达35至70米或更高，树干直径超过2米。
2
The explanation may be in Earth's mantle, the layer of rock underlying the tectonic plates and extending down over 1,800 miles to the outer edge of Earth's iron core.
解释可能是在地球的地幔中，这是在构造板块下面的岩石层，向下延伸超过1800英里到地球铁芯的外边缘。
3
When a continental plate come to rest over a hot spot, the material rising from deeper layer creates a broad dome.