<h3>
Most railroad tracks are built from pieces of steel supported by wooden ties, and laid with a gap between the ends. </h3>
Explanation:
The reasons are:
Firstly , the thermal expansion of solid at higher temperatures.
During the summer season, the steel tracks may expand due to thermal expansion and if gaps are not laid the tracks will bend and lead to accidents.
Secondly, imbibition of water during rainy season.
During the rainy season the wooden tracks will imbibe water and swell. If gaps are not provided, this may result irregular levels of railway track. This may prove very dangerous and lead to railway accident.
Answer:c
Explanation: The plant is responding to external stimuli by growing toward light like our eyes adjusting to the light in the dark......................
Answer: All atoms of an element have the same number of protons, and every element has a different number of protons in its atoms. (I think I'm correct about this)
Explanation: All helium atoms have two protons, and no other elements have atoms with two protons.
Hutton: created the idea that a (water erosion basically)continuing process formed and destroyed the rocks and soils of the Earth and that the process was a never ending loop.
Hutton laid the conceptual foundation for uniformitarianism geology
Lyell: added names and ages to the different layers of rocks
Lyell built the structure of geology upon that foundation
