Answer:
Hydrogen in the core of the star is converted to helium by nuclear fusion. When the hydrogen supply in the core begins to run out, and the star is no longer generating heat by fusion, the core becomes unstable and contracts.
Because of gravity... if you want a more detailed answer look it up on google!
Answer:
d. may belong to any of the three primary rock types
Explanation:
- Metamorphic rock is the transformation of any of the existing rocks through the process of metamorphism i.e associated with changes in form. When the original rocks are subject to intense heat from below. The Pressure over these rocks causes profound hearing and compaction of rocks particles and matter.
- About 12% of the earth's surface is made up of metamorphic rocks that are either derived from the igneous or sedimentary rocks based on texture, chemical, and mineral assemblage.
- Some common examples of these rocks are gneiss, slate, marble, and schist, etc that have been formed from the sedimentary processes.
Answer:
C. part 3
Explanation:
During part 3 of the cycle, water breaks the rocks apart to form sediments.
Part 3 is the erosion and weathering phase.
- Weathering is the physical disintegration and chemical decomposition of rocks to form soils.
- Water is the main agent of denudation that causes the erosion and weathering of rocks.
- Erosion carries the weathered materials from their site of disintegration.
- These sediments are then transported and deposited to form sedimentary rocks.
The country that is an isthmus and links central and Souh America is Panama
