Answer:
Stratovolcanoes are sometimes referred to as composite volcanoes because of the interlayering of lava flows and pyroclastic debris. These volcanoes are frequently more explosive than shield volcanoes due to the higher viscosity of magmas ejected from them.
Explanation:
Answer:
The presence of iridium in concentrations higher than 100 times the normal in the Cretaceous–Paleogene (K–Pg) boundary supports the Alvarez Impact Hypothesis.
Explanation:
Father and Son Alvarez argued that since iridium is present in extremely minute quantities on earth, its presence in very high concentrations in this layer which is thought to date back to 66 million years is evidence that an extraterrestrial impact took place which brought the iridium. The high destructive nature of the impact spread the iridium far and wide which deposited on the surface which is why it is present in this layer which dates back to that period.
The limestone caves at Carlsbad Cavern were formed by hydrogen-sulfide-rich (H2S) waters. This water moved through fractures and faults in the limestone and mixed with rainwater along the way. The mixture gave rise to a substance known as sulfuric acid (H2SO4). Sulfuric acid is able to dissolve limestone, eventually creating Carlsbad Cavern. The process of cave formation ended roughly four million years ago.
Explanation:
The Tanzania Revenue Authority (TRA) is a semi-autonomous Government Agency of the United Republic of Tanzania. It was established by the Tanzania Revenue Act, CAP. 339 in 1995 and started its operations on the 1st of July 1996.
