Earth’s crust would be best modeled by using a material that is - liquid and hot.
liquid and hot.

dense and smooth.
dense and smooth.

soft and flexible.
soft and flexible.

thin and solid.

thin and solid

Explanation:

The "crust" is the outermost part of the Earth. It only accounts for a very small portion of the Earth's mass and that makes it thin. It is made up of different sands, rocks and minerals. This is the reason why it is solid and not liquid (nor is it soft and flexible). It's temperature is not that hot when compared to the inner core. It has the same temperature with the Earth's atmosphere. This allows humans to continue thriving on Earth.

answer; monitor is the correct answer. good luck