My solution to the quiz challenge (also my very first js code). Any feedback would be appreciated!

// Asking five questions

var correctGuess = 0
var answer1 = prompt("What is the longest river in Asia?"); // Yangtze
if (answer1.toUpperCase() === "YANGTZE"){
  alert("Correct! Yangtze is the longest river in Asia - 6,300 km - 3,915 miles (6,301 km)");
  correctGuess += 1  // keeping track of the number of questions the user answered correctly
} else {
  alert("Wrong! Yangtze is the longest river in Asia - 6,300 km - 3,915 miles (6,301 km)");
 }

var answer2 = prompt("What is the Highest mountain in Africa?"); //  Kilimanjaro
  if (answer2.toUpperCase() === "KILIMANJARO") {
  alert("Correct! Kilimanjaro the highest mountain in Africa, and rises approximately 4,877 metres (16,001 ft) from its base to 5,895 metres (19,341 ft) above sea level.");
   correctGuess += 1 
  } else {
   alert("Wrong! Kilimanjaro the highest mountain in Africa, and rises approximately 4,877 metres (16,001 ft) from its base to 5,895 metres (19,341 ft) above sea level.");
  }

var answer3 = prompt("What is the world's largest landlocked country (has no borders on an ocean?"); 
// Kazakhstan
  if (answer3.toUpperCase() === "KAZAKHSTAN") {
  alert("Correct! Kazakhstan is the world's ninth largest country but is the world's largest landlocked country.");
    correctGuess += 1
  } else {
   alert("Wrong! Kazakhstan is the world's ninth largest country but is the world's largest landlocked country.");
  }

var answer4 = prompt("Which country is the fifth largest in the world by surface area?"); // Brazil
  if (answer4.toUpperCase() === "BRAZIL") {
  alert("Correct! Brazil is the fifth largest country in the world by surface area after Russia, Canada, China, the United States.");
    correctGuess += 1
  } else {
   alert("Wrong! Brazil is the fifth largest country in the world by surface area after Russia, Canada, China, the United States.");
  }

var answer5 = prompt("Which country has the largest population in Africa?"); // Nigeria
  if (answer5.toUpperCase() === "NIGERIA") {
  alert("Correct! The country with the largest population in Africa is Nigeria, with 154,729,000 inhabitants.");
    correctGuess += 1
  } else {
   alert("Wrong! The country with the largest population in Africa is Nigeria, with 154,729,000 inhabitants.");
  }

// letting the player know how many correct answers they got
document.write("<h1>You got " + correctGuess + " questions right!</h1>");

// ranking the player
if (correctGuess === 5) {
  document.write("<h2>You earned a GOLD crown</h2>");
} else if (correctGuess >= 3) {
  document.write("<h2>You earned a SILVER crown</h2>");
} else if (correctGuess >= 1) {
  document.write("<h2>You earned a BRONZE crown</h2>");
} else {
  document.write("<h2>Sorry, today is not your day!</h2>");
}