The astenosphere plays a key role in the plate tectonics theory because it is the one that provides the high temperatures, high pressure, and magma, that are the ones responsible for cracking up the crust on the surface.
The astenosphere, with the ability to crack the crust on the surface of the planet is creating the continental and oceanic tectonic plates, and it also provides the push force from bellow so that they can move across the globe and thus be creating the landscape on the planet.
A. seafloor spreading at mid-ocean ridges
Answer:
Life began on Earth at least 3.5 to 4 billion years ago, and it has been evolving ever since. At first, all living things on Earth were simple, single-celled organisms. Much later, the first multicellular organisms evolved, and after that, Earth's biodiversity greatly increased.
Explanation:
In this question, we are not provided with the image of the dinosaur track. Because of this, we are unable to tell whether this specific track is right-side up or upside-down. However, we can give you some guidance so that you can identify this on your own.
In general, in this type of prints, mud cracks extend downward into soft sediment. These cracks mean that when more sediment is washed in, the second layer fills the cracks beneath. Afterwards, once the layers have hardened, the rock may be cracked apart. Based on this, we can conclude that if you see troughs in a mud-crack pattern, you re looking at the second layer, which was originally right-side up.
The awnser is a because it is the best awnser
