The three classifications of magma are mainly identified using their silica composition. Basaltic magma has the lowest silica content of 45-55% by weight. This makes it the least viscous and least explosive. Andesitic magma has 55-65% , making it more explosive and viscous. Rhyolitic magma has 65-75% silica, and is the most viscous and catastrophic.
Earthquakes are caused when 2 plates release friction
Volcanoes are formed when magma reaches the surface as it builds up over time.
So they mostly occur either on or near plate boundaries.
Answer:
Climate change is a global phenomenon. The intensity of the impacts will vary across the globe. For example, in the low lying islands, sea level rise will be the obvious impact, cause the water wells/bores to become salty. This will also pose threat for crops and plants to grow. For larger islands and continents(as is for South Africa), increasing temperature will lead to prolonged dry season and drought. Also frequency of rainy season leading to flooding. In similar context, will also affect food production.
Back to the question, how were you going to solve the problem? This is a tough question that have challenged scientists, academics, policy makers and the ordinary citizens like us for decades now. There are two words commonly used when dealing with impacts of climate change, Adaptation and mitigation.
For adaptation, one have to look on tangible solutions to response to the impacts. Example for salt water killing crops, plant crops that can withstand brackish water. This is only an example.
For mitigation, this is what our leaders have been discussing during the COP conferences. To reduce the amount of greenhouse as including CO2 pumped into the atmosphere by industries.
So the question, both adaptation and mitigation measure will have to be adopted. But you cannot solve the problem, only adapted to the changes.
Explanation:
Answer:
Common Ancestry
Explanation:
This may be because they share a common ancestry or maybe should I say background so they tend to practice the same customs and traditions
Answer: b. Asteroids can cause great damage if they collide with Earth.
Explanation:
The main idea is that asteroids can cause great damage to earth if they collide with our planet. This is what the entire article was centred around starting with an example of the effects of the last time there was a collision with Earth.
It then goes forward to talk about the chances of being hit by another asteroid and what scientists will do if the Earth is at risk of being hit by one which shows that the whole point of the article is the damage asteroids can cause on earth and why this should be avoided.
