It’s a.
The greenhouse effect is how we Earth’s climate has remained habitable for humans and other species.
Gases absorb solar energy and keep the heat close to earths surface, rather than letting it escape into space.
Answer:
B. Europe
Explanation:
The establishment of the European Union after the sign of the Maastricht Treaty eliminate customs for goods, services and people withing a great portion of Europe since early 1990s.
The answer is D. Russia -- Moscow
Igneous rocks are formed as magma solidifies on the earth surface.
The process that might have formed this rock is:
A. melting underground, violent volcanic eruption, and solidification above ground
<h3>Igneous Rocks</h3>
Igneous rocks are known to be rocks that are formed when the magma melts underground and rises up to the earth surface via volcanic eruptions.
When they rise to the earth surface, they cool and solidify. This process will then result to the production of crystals.
Intrusive and extrusive rocks are formed in this process.
Learn more about igneous rocks on brainly.com/question/20538428
