Why doesn't Moodle run on LEMP?

Question

PHP

Hello. We were given the task to install Moodle CMS on a LEMP stack. LEMP installed , downloaded moodle , now in the browser instead of showing the moodle installation page, it goes to download the php file.
here's what's inside
here is the /etc/nginx/conf.d/default.conf file settings
#
# The default server
#
server {
listen 80;
server_name example.com;
location / {
root /usr/share/nginx/html;
index index.php index.html index.htm;
}
error_page 404 /404.html;
location = /404.html {
root /usr/share/nginx/html;
}
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root /usr/share/nginx/html;
}
# pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
#
location ~ \.php$ {
root /usr/share/nginx/html;
fastcgi_pass 127.0.0.1:9000;
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
include fastcgi_params;
}
}
Where could I mess up?