Question

which tsunami is known for the greatest death toll in recent history?
2004 indonesian boxing day tsunami
1958 lituya bay earthquake and tsunami
2010 tohuko earthquake and tsunami
2018 sulawesi earthquake and tsunami
question 18
mass wasting is defined as?
downhill movement of material (soil and/or rock)
massive erosion in mountainous regions
landslides of purely rocky materials
the slow movement of soil downhill

Explanation:

• For the first question: The 2004 Indonesian Boxing Day Tsunami (also known as the 2004 Indian Ocean Tsunami) had an extremely high death toll, with an estimated 230,000 - 280,000 people losing their lives. The 1958 Lituya Bay Tsunami had a death toll of 5 (though it had a very large wave height due to a landslide - triggered event). The 2010 Tohuko Earthquake and Tsunami (in Japan) had a death toll of about 15,891. The 2018 Sulawesi Earthquake and Tsunami had a death toll of around 4,340.
• For the second question: Mass wasting is the downhill movement of material (soil and/or rock) under the influence of gravity. It can include slow - moving processes (like creep) and fast - moving processes (like landslides). It's not just about massive erosion in mountainous regions (which is more about the removal of material by agents like water, wind etc. over a larger area and longer time in a more general sense of erosion). It's not only landslides of purely rocky materials (as it can involve soil too), and it's not just the slow movement of soil downhill (as it can be fast and involve rock).

Answer:

• First question: 2004 Indonesian Boxing Day Tsunami
• Second question: downhill movement of material (soil and/or rock)