Question

the grand canyon is considered the deepest trench on earth.
a canyon in antarctica was discovered to be 1.5 times deeper than the grand canyon.
however therefore ← joining words
① rewrite the sentences, and use one of the joining words in the correct place. your final response should be two sentences.
type your answer here.

Explanation:

The first sentence claims the Grand Canyon is the deepest, but the second says an Antarctic canyon is deeper, so "however" is the correct joining word to show contrast. We rewrite the sentences to use "however" appropriately, keeping two sentences.

Answer:

The Grand Canyon is considered the deepest trench on Earth. However, a canyon in Antarctica was discovered to be 1.5 times deeper than the Grand Canyon.