1. The answer is A: size. <em>Magnitute</em> means large size or great importance. <em>Ripple effect</em> means one event producing effects that produce further effects.
2. The answer is C: rubbish. <em>Debris</em> means broken or torn pieces of something larger.
3. The answer is C: spread. <em>Dispersed</em> means to scatter or move away over a large area, or to cause this to happen.
<em>To combust</em>: to start to burn.
<em>To wade</em>: to walk through water
<em>To leak</em>: to allow liquid or gas to escape.