A group of small volcanoes, called the petit spot volcanoes, was recently found. What makes this find so unusual is they are believed to be formed:

W) from asthenosphere material squeezing through cracks caused by bending in Earth's crust

X) from plumes rising rapidly from the boundary between Earth's core and mantle

Y) at a convergent plate boundary

Z) at a mid-ocean ridge
W) FROM ASTHENOSPHERE MATERIAL SQUEEZING THROUGH CRACKS CAUSED BY BENDING IN EARTH'S CRUST