______is called the ship of the Desert.

Fill in the Blanks : ______is the chemical name of rust.

A ship is sailing towards the north at a speed of 1.25 m/s. The current is taking it towards the east at the rate of 1 m/s and a sailor is climbing a vertical pole on the ship at the rate of 0.5 m/s. Find the velocity of the sailor in space.

______is the innermost membrane of the brain.

______is a disease ,due to the deficiency of Vitamin A.

______is the highest level of organisation among the animals.

______is used to measure the accurate time of the activity.

In in ocean surveillance system of ship fitted with a (RADAR) the time dely between generation of a radio waves reflected from an enemy ship is observed to be 5.6s. Calculate the distance of the enemy ship from the surveillance ship.

Write the characteristics of the deserts having 150-250 mm annual precipitation