Antarctica and Australia.
Of the seven continents the only two close to being "mostly desert", with the definition of desert as an area of limited rainfall and, hence, little vegetation, are Australasia and Antarctica.
There are no continents that do not have deserts. Even Europe has a small patch of desert in Spain - Las Tabernas Desert - and almost the entire continent of Antarctica is a desert.
Europe and Asia are the two continents located mostly in the northern and eastern hemispheres. The boundary between the two continents is not clearly defined, but they are traditionally considered separate continents due to historical and cultural differences.
South America and Australia
All continents have desert biomes, even Europe.
Egypt is mostly in Africa and has a small part in Asia.
All continents have deserts, including Europe which has some small desert areas.
Africa and Asia have the most deserts in terms of land area. Africa is home to the Sahara Desert, while Asia includes the Arabian Desert, Gobi Desert, and others.
Two: North America and South America.
none! There is ocean between the 2 continents
Asia, Europe, Africa, and Australia are continents that are mostly in the eastern hemisphere.
There is no Sierra Desert. If you are referring to the Sahara Desert, it is in Africa.